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प्रश्न
Fill in the blank
Light consists of .............. colours.
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उत्तर
Light consists of seven colours.
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संबंधित प्रश्न
Fill in the blank.
Light gives us the sensation of ................
Explain the difference between a transparent, a translucent, and an opaque medium. Give two examples of each.
Write the names of some cold light-emitting objects.
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A ............. is formed when the path of light is obstructed by an ..............
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Speed of light in vacuum is .................
Answer the following.
What is light?
A ______ is an artificial source of light.
________ objects allow all the light to pass through them.
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 |
Why are traffic signals red in colour?
