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प्रश्न
Answer the following.
Write down five man-made sources of light.
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उत्तर
Electric bulb, torch, an oil lamp, fluorescent tube, candle.
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संबंधित प्रश्न
Fill in the blank
A medium through which light cannot pass is called the ....................
Fill in the blank.
Moon is a .................. body.
Write the names of some cold light-emitting objects.
The sun and ______ are the natural sources of light.
Fill in the blank
The brightness of light is measured in ...................
Answer the following.
What is meant by luminous intensity? What is one lumen?
A ______ is a natural source of light.
When a ______ object comes in the way of light, light passes ______ it.
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.
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?
