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प्रश्न
Name a few living things which emit light.
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उत्तर
Jugnu and firefly.
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संबंधित प्रश्न
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 |
List two artificial sources of light.
What do we call an electric bulb producing light?
What do we call a substance through which we cannot see light? Give an example of such a substance.
Tick the correct answer.
The natural source of light is
Fill in the blank
There are ........... and man-made ............ of light.
________ objects allow all the light to pass through them.
Speed of light in air is 3 × 108 m s–1 and the refractive index of a medium is 1.5. Find the speed of light in the medium.
What happens to light when it gets dispersed? Give an example.
Light is a form of energy and it travels in a straight line.
