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प्रश्न
Select the correct alternative.
The luminous body is
विकल्प
a lighted bulb
earth
noon
table
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उत्तर
a lighted bulb
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संबंधित प्रश्न
What do we call a body that shines on its own?
Name any four man made sources of light.
Name a few living things which emit light.
Tick the correct answer.
The natural source of light is
Fill in the blank
Light consists of .............. colours.
Mirrors change the direction of light that fall on them.
State whether true or false. If false, correct the statement.
If a ray of light passes obliquely from one medium to another, it does not suffer any deviation.
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 |
a) Draw ray diagrams to show how the image is formed using a concave mirror, when the position of object is:
- at C
- between C and F
- between F and P of the mirror.
b) Mention the position and nature of image in each case.
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?
