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Questions and Answers
What is the nature of light waves?
What type of sources are the sources of light?
What happens to the speed and wavelength of light when it travels from one medium to another?
What are non-luminous objects?
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What is a ray of light?
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What is the speed of light in vacuum?
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Which objects are referred to as luminous objects?
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What happens to the speed and wavelength of light when it travels from one medium to another?
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What are non-luminous objects?
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What are the characteristics of light waves?
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Study Notes
Nature of Light Waves
- Light waves are a form of electromagnetic radiation, exhibiting both wave-like and particle-like properties.
Sources of Light
- Luminous objects, such as the sun, stars, and fire, are sources of light that emit their own light.
- Non-luminous objects, such as the moon and mirrors, reflect light from other sources.
Light Travelling Through Media
- When light travels from one medium to another, its speed changes, but its frequency remains constant.
- As a result, the wavelength of light also changes, being inversely proportional to the speed of light.
Light Terminology
- A ray of light is a line that represents the direction of propagation of light.
- Non-luminous objects are objects that do not emit their own light, but can reflect or absorb light from other sources.
Speed of Light
- The speed of light in vacuum is approximately 299,792,458 meters per second (m/s).
Luminous Objects
- Luminous objects, such as the sun, stars, and fire, emit their own light and are sources of light.
Characteristics of Light Waves
- Light waves are electromagnetic waves, exhibiting both wave-like and particle-like properties.
- They have a frequency, wavelength, and speed, and can be refracted, reflected, and absorbed.
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Description
Test your knowledge of ray optics and optical instruments with this quiz on light and its characteristics. Explore the sources of light, photometry, and the nature of light waves. Perfect for Class 12 Physics students.
