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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
How do we see objects around us ?
Fill in the blank.
Light travels in a ................. path.
Match the following columns
| Column A | Column B |
| a. Wooden block | i. new moon's day |
| b. Sun | ii. rectilinear propagation of light |
| c. Umbra | iii. opaque body |
| d. Eclipse | iv. luminous body |
| e. Solar eclipse | v. complete dark park |
What is a transparent medium? Give two examples.
From among the following objects, list out the opaque, translucent, and transparent bodies in the space provided below:
A glass strip, an ordinary paper, greased paper, tracing paper, polythene sheet, wooden piece, steel plate, glycerine, kerosene oil, mustard oil, grounded glass, stone, book, water, and milk.
Opaque Transparent Translucent
Tick the correct answer.
A tube light is a
Answer the following.
Name some sources of light that are not hot.
Choose the translucent substance from the following
The angle of deviation of light ray in a prism depends on the angle of ______.
Amount of light entering into the eye is controlled by ______.
