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प्रश्न
List any five properties of light.
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उत्तर
- Light is a form of energy.
- Light always travels along a straight line.
- Light does not need any medium for its propagation. It can even travel through a vacuum.
- The speed of light in a vacuum or air is c = 3 × 108 ms-1.
- Since light is in the form of waves, it is characterized by a wavelength (k) and a frequency (v), which are related by the following equation: c = v λ (c – velocity of light).
- Different coloured light has different wavelength and frequency.
- Among the visible light, violet light has the lowest wavelength and red light has the highest wavelength.
- When light is incident on the interface between two media, it is partly reflected and partly refracted.
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संबंधित प्रश्न
List two artificial sources of light.
Tick the correct answer.
Light causes
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The natural source of light is
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| Column A | Column B |
| 1. Transparent object | i. Football |
| 2. Eclipses | ii. Glass |
| 3. Translucent object | iii. Fluorescent tube |
| 4. Luminous object | iv. Tracing paper |
| 5. Non - luminous object | v. Shadows |
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What is meant by luminous intensity? What is one lumen?
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An object can be seen only if it emits light
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