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प्रश्न
Write true or false
The earth has its own light.
विकल्प
True
False
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उत्तर
False
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संबंधित प्रश्न
Can light travel in vacuum?
Write true or false of the following statement.
Light travels in a straight-line path.
Name two natural sources of light.
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.
Fill in the blank
The brightness of light is measured in ...................
Fill in the blank
Speed of light in vacuum is .................
Sunlight is a blend of______ colors
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 |
Observe the picture given in the following figure carefully.
A patch of light is obtained at B, when the torch is lighted as shown. Which of the following is kept at position A to get this patch of light?
