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प्रश्न
List any five properties of light.
संक्षेप में उत्तर
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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
Write true or false of the following statement.
The moon is a natural source of light.
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Light gives us the sensation of ................
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Moon is a .................. body.
Select the correct alternative.
The natural source of light is
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The brightness of light is measured in ...................
A ______ is a natural source of light.
________ objects allow all the light to pass through them.
A ray of light passes from one medium to another medium. Refraction takes place when angle of incidence is ______.
In going from a rarer to denser medium, the ray of light bends ______.
Match the following.
| 1. | Ratio of height of image to height of object. | Concave mirror |
| 2. | Used in hairpin bends in mountains. | Total internal reflection |
| 3. | Coin inside water appearing slightly raised. | Magnification |
| 4. | Mirage | Convex mirror |
| 5. | Used as Dentist’s mirror. | Refraction |
