Optics and Acoustics - Revision history

Fordharma at 10:49, 28 April 2026

2026-04-28T10:49:44Z

Fordharma at 10:48, 28 April 2026

2026-04-28T10:48:45Z

Fordharma at 09:43, 28 April 2026

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Fordharma at 08:50, 28 April 2026

2026-04-28T08:50:30Z

Fordharma at 07:03, 28 April 2026

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Fordharma at 06:49, 28 April 2026

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Fordharma at 06:39, 28 April 2026

2026-04-28T06:39:31Z

Fordharma: /* 1. Nature and Elemental Classification */

2026-04-28T06:37:11Z

1. Nature and Elemental Classification

Fordharma at 06:35, 28 April 2026

2026-04-28T06:35:30Z

Fordharma: Created page with "Light as a topic is dealt with in Optics and sound in Acoustics. Light Information regarding light across these sources encompasses its encompasses its classification as a fu..."

2026-04-28T06:30:08Z

Created page with "Light as a topic is dealt with in Optics and sound in Acoustics. Light Information regarding light across these sources encompasses its encompasses its classification as a fu..."

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Light as a topic is dealt with in Optics and sound in Acoustics. Light Information regarding light across these sources encompasses its encompasses its classification as a fundamental element, its role in the mechanism of vision, detailed calculations of its speed, and advanced physical behaviors such as reflection, refraction, and spectral analysis.

### **1. Nature and Elemental Classification**
* **The Element Tejas:** Light is fundamentally identified with **Tejas (fire)**, one of the five *Panchamahabhutas*. It is described as a substance that **destroys darkness** (*Tamas*) and is characterized by a **brilliant white colour** (*Bhaswara shukla*) and **hot touch** (*Ushna Sparsha*).
* **Origin:** In ancient texts like the Taittirīya Upaniṣad, *Tejas* is said to be born out of the friction of **Vayu** (air/motion).
* **Types of Light (Tejas):** It is categorized into several forms:
* **Bhouma:** Earthly fire (e.g., burning wood).
* **Divya:** Heavenly light, such as the Sun, stars, and lightning.
* **Audarya:** Stomachic fire (metabolic energy for digestion).
* **Akaraja:** The luster or brightness of minerals like gold and silver.

### **2. Theories of Vision and Perception**
* **Evolution of Vision Theory:** Early Indian philosophical systems hypothesized that light rays emanated **from the eyes** to touch objects, similar to a candle casting light.
* **Susruta’s Correction:** This view was corrected around the 1st Century CE by **Susruta**, who posited that light arriving from an **external source** hits the retina to illuminate the world—a view later supported by **Aryabhata** in the 5th Century.
* **Visual Sense Organ:** The eye is considered the seat of the visual sense organ (*Caksurindriya*), which is composed primarily of *Tejas* particles, allowing it to specifically perceive **colour and form** (*Rupa*).

### **3. The Speed of Light**
* **Vedic Calculations:** A renowned reference to the velocity of light is found in **Sayana’s 14th-century commentary** on Rig Veda 1.50.4.
* **The Formula:** The text states that the Sun’s light traverses **2,202 yojanas in half a nimisha**.
* **Modern Equivalence:** When converted, this ancient calculation yields approximately **299,000,000 meters per second** (or ~185,016 miles per second), which is remarkably close to the modern scientific value of 299,792,458 m/s.
* **Relative Speed:** The *Surya Siddhanta* notes that Sun’s rays travel **ten times faster** than the Moon’s, and early philosophers like Cakrapani suggested that light travels much faster than sound, though both move in waves.

### **4. Physical Behaviors and Optics**
* **Propagation:** Sage Kanada in the *Vaisheshika Sutra* stated that light particles are extremely subtle and move in **straight paths**. They are described as indefinitely small particles radiating with a **conical dispersion**.
* **Reflection and Refraction:**
* **Reflection** was explained as light rays striking a surface (like a mirror) and **rebounding** back to the observer.
* **Refraction** was understood as a **deflection** or change in velocity as light moves through different media, such as when it penetrates porous bodies or water.
* **Scattering (The Raman Effect):** Modern Indian contribution includes **C.V. Raman’s** discovery that the blue color of the sea is caused by the **scattering effect of sunlight**.
* **Particle Duality:** While modern science uses photons, ancient **Mimamsakas** also imagined light as minute **particles in constant motion** spreading through radiation and diffusion.

### **5. The Spectrum and Colors**
* **Seven Colors:** The Rig Veda poetically refers to the Sun's chariot being drawn by **seven horses**, which is interpreted as the light being composed of **seven rays** or colors. These correspond to red, orange, yellow, green, blue, indigo, and violet.
* **Spectral Analysis:** Maharshi Bhardwaj’s work, *Amsubodhini*, describes instruments to measure the spectra in three regions: **Infrared** (*Gudhatam*), **Visible** (*Tam*), and **Ultraviolet** (*Andhatam*).
* **Advanced Materials:** The same work describes a material called ***Prakash Stambhanabhid Lauha***, which was engineered to be **transparent to infrared** radiation but **opaque to visible light**.

### **6. Philosophical and Symbolic Meaning**
* **Light as Knowledge:** In Hindu tradition, light is a primary symbol for **Jnana (knowledge)** and **Prakasha (illumination of consciousness)**, used to dispel the "darkness" of ignorance.
* **Jyotish:** The word *Jyotish* (Vedic astronomy/astrology) literally means **"light"**, referring to the science that sheds light on the mysteries of the universe.

← Older revision		Revision as of 10:49, 28 April 2026
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	* Vision depends on light and the quality of color.		* Vision depends on light and the quality of color.
	* Faulty senses or mind obstruct knowledge.		* Faulty senses or mind obstruct knowledge.
		+
		+	== References ==
		+	[[Category:Shastras]]
		+	[[Category:Physics]]

@@ Line 1: / Line 1: @@
 Light as a topic is dealt with in Optics and sound in Acoustics. Visual and auditory senses play an important role as primary carriers of information. Indian shastras referred to light as prakasa, tejas. Indian texts encompass its classification as a fundamental element, its role in the mechanism of vision, detailed calculations of its speed, and advanced physical behaviors such as reflection, refraction, and spectral analysis. Ear recognizes sound related to the Akasha element. Remarkably modern and ancient Indian theory regarding the origin and propagation of sound are largely aligned.
@@ Line 29: / Line 31: @@
 * '''Evolution of Vision Theory:''' Early Indian philosophical systems hypothesized that light rays emanated '''from the eyes''' to touch objects, similar to a candle casting light.
-* '''Susruta’s Correction:''' This view was corrected around the 1st Century CE by '''Susruta'', who posited that light arriving from an external source hits the retina to illuminate the world—a view later supported by '''Aryabhata''' in the 5th Century.
+* '''Susruta’s Correction:'<nowiki/>'' This view was corrected around the 1st Century CE by '''''<nowiki/>''Susruta'', who posited that light arriving from an external source hits the retina to illuminate the world—a view later supported by '''Aryabhata''' in the 5th Century.
 * '''Visual Sense Organ:''' The eye is considered the seat of the visual sense organ (''Caksurindriya''), composed primarily of ''Tejas'' particles, allowing it to specifically perceive colour and form (''Rupa'').

← Older revision		Revision as of 09:43, 28 April 2026
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	== Introduction ==		== Introduction ==
		+	Indian texts offer a large number of principles and concepts regarding light and sound. Yogasutras present Nada, the primordial sound, as fundamental to the understanding of consciousness and the material world. Nada is conceptualized both as the physical vibration and a metaphysical essence for the origin of creation.
		+	Light in Indian tradition is not merely physical illumination but enables perception and cognition. Indian concept of light just like sound, transcends simple optical physics, and encompasses both physical and metaphysical aspects. Epistemically light is that which both exists and reveals existence.
		+
		+	== Sources of Indian Optical and Acoustic Knowledge ==
		+	* Siksha Granthas - They offer the foundational knowledge of sound production and articulation of words.
		+	* Natyashastra - It elaborates on sophisticated theories of musical acoustics and harmony. Differences between musical instruments is dealt with.
		+	* Nyaya and Vaiseshika Darshanas - They offer theories about human auditory cognition and describe how the propagation of sound occurs through air.
		+	* Upanishads - These texts discuss the metaphysics of light and vibration.
		+
		+	Temple architecture embodies the very principles of resonance, illumination and even musical notes.

	== Nature and Elemental Classification ==		== Nature and Elemental Classification ==

@@ Line 69: / Line 69: @@
 * '''Jyotish:''' The word '''Jyotish''' (Vedic astronomy/astrology) literally means '''light''', referring to the science that sheds light on the mysteries of the universe.
-== 1. The Definition of Direct Perception (Pratyakṣa) ==
+== The Definition of Direct Perception (Pratyakṣa) ==
 The foundational definition of perception in the '''Nyāya''' school is based on the contact between the sense organ and the object.
@@ Line 82: / Line 82: @@
 Meaning: Knowledge produced by the contact of a sense organ (''indriya'') and its object (''artha'') is called perception (''pratyakṣa'').
-== 2. The Mechanism of Perception ==
+== The Mechanism of Perception ==
 Ayurvedic and philosophical texts describe perception as a coordinated process involving the sense organ, the mind (''manas''), and the self (''ātman'').
@@ Line 116: / Line 116: @@
 Meaning: Knowledge arises through conjunction of the self, the senses, and their objects.
-== 3. The Nature of Vision and Light ==
+== The Nature of Vision and Light ==
 In Indian Knowledge Systems, vision is associated with '''Tejas''' (fire/radiance) and '''Rūpa''' (form or color).
@@ Line 142: / Line 142: @@
 This tradition describes particles of light as extremely subtle and moving in straight paths.
-== 4. Obstacles to and Conditions for Perception ==
+== Obstacles to and Conditions for Perception ==
 Perception may fail if the instruments of knowledge (mind or senses) are impaired.
@@ Line 159: / Line 159: @@
 * Just as no reflection is seen in a dirty mirror, perception fails when the mind or senses are defective.
-== 5. Classification of Perceivable Objects ==
+== Classification of Perceivable Objects ==
 * '''Vaiśeṣika Sūtra (4.2.1):'''
@@ Line 174: / Line 174: @@
 * '''Viṣaya''' – sense objects
-== 6. Summary ==
+== Summary ==
 According to these traditions:

← Older revision		Revision as of 07:03, 28 April 2026
Line 1:		Line 1:
−	Light as a topic is dealt with in Optics and sound in Acoustics. ~~Light is~~ referred to ~~using various terms such~~ as prakasa, tejas ~~in Samskrit~~. Indian texts encompass its classification as a fundamental element, its role in the mechanism of vision, detailed calculations of its speed, and advanced physical behaviors such as reflection, refraction, and spectral analysis. Ear recognizes sound	+	Light as a topic is dealt with in Optics and sound in Acoustics. Visual and auditory senses play an important role as primary carriers of information. Indian shastras referred to light as prakasa, tejas. Indian texts encompass its classification as a fundamental element, its role in the mechanism of vision, detailed calculations of its speed, and advanced physical behaviors such as reflection, refraction, and spectral analysis. Ear recognizes sound related to the Akasha element. Remarkably modern and ancient Indian theory regarding the origin and propagation of sound are largely aligned.
−

		+	== Introduction ==

	== Nature and Elemental Classification ==		== Nature and Elemental Classification ==

@@ Line 1: / Line 1: @@
-Light as a topic is dealt with in Optics and sound in Acoustics. Light Information regarding light across these sources encompasses its  encompasses its classification as a fundamental element, its role in the mechanism of vision, detailed calculations of its speed, and advanced physical behaviors such as reflection, refraction, and spectral analysis.
+Light as a topic is dealt with in Optics and sound in Acoustics. Light is referred to using various terms such as prakasa, tejas in Samskrit. Indian texts encompass its classification as a fundamental element, its role in the mechanism of vision, detailed calculations of its speed, and advanced physical behaviors such as reflection, refraction, and spectral analysis. Ear recognizes sound
 == Nature and Elemental Classification ==
@@ Line 5: / Line 7: @@
 * '''The Element Tejas:''' Light is fundamentally identified with '''Tejas''' (fire), one of the five ''Panchamahabhutas''. It is described as a substance that destroys darkness (''Tamas'') and is characterized by a brilliant white colour (''Bhaswara Shukla'') and hot touch (''Ushna Sparsha'').
-* '''Origin:''' In ancient texts like the ''Taittirīya Upaniṣad'', ''Tejas'' is said to be born out of the friction of '''Vayu''' (air/motion).
+* '''Origin:''' In the ''Taittirīya Upaniṣad'', ''Tejas'' is said to be born out of the friction of '''Vayu''' (air/motion).
 * '''Types of Light (Tejas):'''
@@ Line 66: / Line 68: @@
 * '''Jyotish:''' The word '''Jyotish''' (Vedic astronomy/astrology) literally means '''light''', referring to the science that sheds light on the mysteries of the universe.

@@ Line 13: / Line 13: @@
    ** '''Akaraja''' – The luster or brightness of minerals like gold and silver
-== 2. Theories of Vision and Perception ==
+== Theories of Vision and Perception ==
 * '''Evolution of Vision Theory:''' Early Indian philosophical systems hypothesized that light rays emanated '''from the eyes''' to touch objects, similar to a candle casting light.
@@ Line 21: / Line 21: @@
 * '''Visual Sense Organ:''' The eye is considered the seat of the visual sense organ (''Caksurindriya''), composed primarily of ''Tejas'' particles, allowing it to specifically perceive colour and form (''Rupa'').
-== 3. The Speed of Light ==
+== The Speed of Light ==
 * '''Vedic Calculations:''' A renowned reference to the velocity of light is found in '''Sayana’s''' 14th-century commentary on ''Rig Veda'' 1.50.4.
@@ Line 31: / Line 31: @@
 * '''Relative Speed:''' The ''Surya Siddhanta'' notes that Sun’s rays travel ten times faster than the Moon’s, and philosophers like '''Cakrapani''' suggested that light travels much faster than sound.
-== 4. Physical Behaviors and Optics ==
+== Physical Behaviors and Optics ==
 * '''Propagation:''' Sage '''Kanada''' in the ''Vaisheshika Sutra'' stated that light particles are extremely subtle and move in straight paths. They are described as indefinitely small particles radiating with conical dispersion.
@@ Line 43: / Line 43: @@
 * '''Particle Concept:''' Ancient '''Mimamsakas''' also imagined light as minute particles in constant motion spreading through radiation and diffusion.
-== 5. The Spectrum and Colors ==
+== The Spectrum and Colors ==
 * '''Seven Colors:''' The ''Rig Veda'' poetically refers to the Sun's chariot being drawn by seven horses, interpreted as seven rays or colors:
@@ Line 61: / Line 61: @@
 * '''Advanced Materials:''' The same work describes a material called '''Prakash Stambhanabhid Lauha''' engineered to be transparent to infrared radiation but opaque to visible light.
-== 6. Philosophical and Symbolic Meaning ==
+== Philosophical and Symbolic Meaning ==
 * '''Light as Knowledge:''' In Hindu tradition, light symbolizes '''Jnana''' (knowledge) and '''Prakasha''' (illumination of consciousness), dispelling the darkness of ignorance.
 * '''Jyotish:''' The word '''Jyotish''' (Vedic astronomy/astrology) literally means '''light''', referring to the science that sheds light on the mysteries of the universe.

@@ Line 1: / Line 1: @@
 Light as a topic is dealt with in Optics and sound in Acoustics. Light Information regarding light across these sources encompasses its  encompasses its classification as a fundamental element, its role in the mechanism of vision, detailed calculations of its speed, and advanced physical behaviors such as reflection, refraction, and spectral analysis.
-### **1. Nature and Elemental Classification**
+== 1. Nature and Elemental Classification ==
-### **2. Theories of Vision and Perception**
+* '''The Element Tejas:''' Light is fundamentally identified with '''Tejas''' (fire), one of the five ''Panchamahabhutas''. It is described as a substance that destroys darkness (''Tamas'') and is characterized by a brilliant white colour (''Bhaswara Shukla'') and hot touch (''Ushna Sparsha'').
-### **3. The Speed of Light**
+* '''Origin:''' In ancient texts like the ''Taittirīya Upaniṣad'', ''Tejas'' is said to be born out of the friction of '''Vayu''' (air/motion).
-### **4. Physical Behaviors and Optics**
+* '''Types of Light (Tejas):'''
-*   **Propagation:** Sage Kanada in the *Vaisheshika Sutra* stated that light particles are extremely subtle and move in **straight paths**. They are described as indefinitely small particles radiating with a **conical dispersion**.
+   ** '''Bhouma''' – Earthly fire (e.g., burning wood)
-*   **Reflection and Refraction:**
+   ** '''Divya''' – Heavenly light, such as the Sun, stars, and lightning
-    *   **Reflection** was explained as light rays striking a surface (like a mirror) and **rebounding** back to the observer.
+   ** '''Audarya''' – Stomachic fire (metabolic energy for digestion)
-    *   **Refraction** was understood as a **deflection** or change in velocity as light moves through different media, such as when it penetrates porous bodies or water.
+   ** '''Akaraja''' – The luster or brightness of minerals like gold and silver
-### **5. The Spectrum and Colors**
+== 2. Theories of Vision and Perception ==
-### **6. Philosophical and Symbolic Meaning**
+* '''Evolution of Vision Theory:''' Early Indian philosophical systems hypothesized that light rays emanated '''from the eyes''' to touch objects, similar to a candle casting light.
-*   **Light as Knowledge:** In Hindu tradition, light is a primary symbol for **Jnana (knowledge)** and **Prakasha (illumination of consciousness)**, used to dispel the "darkness" of ignorance.
-*   **Jyotish:** The word *Jyotish* (Vedic astronomy/astrology) literally means **"light"**, referring to the science that sheds light on the mysteries of the universe.
+* '''Susruta’s Correction:''' This view was corrected around the 1st Century CE by '''Susruta'', who posited that light arriving from an external source hits the retina to illuminate the world—a view later supported by '''Aryabhata''' in the 5th Century.