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प्रश्न
List any five properties of light.
थोडक्यात 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
Match the following
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| (e). Red, green, and blue | (5). slows down |
Write true or false of the following statement.
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Write true or false of the following statement.
Light travels in a straight-line path.
Fill in the blank.
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Explain the difference between a transparent, a translucent, and an opaque medium. Give two examples of each.
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Light consists of .............. colours.
Answer the following.
Name some sources of light that are not hot.
Match the following.
| Group A | Group B |
| (a) Mirror | (1) Non-luminous |
| (b) Firefly | (2) Inverted image |
| (c) Pinhole camera | (3) Reflection |
| (d) Moon | (4) Luminous |
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Velocity of light is greater in denser medium than in rarer medium
