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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
How do we see objects around us ?
Fill in the blank.
Moon is a .................. body.
List two artificial sources of light.
Differentiate between the luminous and non-luminous bodies. Give two examples of each.
Why do objects in a room become visible even if sunlight does not enter it?
Match the following.
| Group A | Group B |
| (a) Mirror | (1) Non-luminous |
| (b) Firefly | (2) Inverted image |
| (c) Pinhole camera | (3) Reflection |
| (d) Moon | (4) Luminous |
A ray of light passes from one medium to another medium. Refraction takes place when angle of incidence is ______.
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 |
State whether the following statement is True or False.
An object can be seen only if it emits light
Boojho made light from a laser torch fall on a prism. Will he be able to observe a band of seven colours? Explain with a reason.
