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प्रश्न
The sun and ______ are the natural sources of light.
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उत्तर
The sun and stars are the natural sources of light.
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संबंधित प्रश्न
Fill in the blank.
A medium which allows light to pass through it easily is called the ...................
Select the correct alternative.
The luminous body is
Does the flame of a gas stove emit light?
Answer the following.
Write down five man-made sources of light.
Answer the following.
What is meant by luminous intensity? What is one lumen?
Answer the following.
Name some sources of light that are not hot.
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 |
Velocity of light is greater in denser medium than in rarer medium
Boojho and Paheli were given one mirror each by their teacher. Boojho found his image to be erect and of the same size whereas Paheli found her image erect and smaller in size. This means that the mirrors of Boojho and Paheli are, respectively
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?
