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प्रश्न
Tick the correct answer.
Substance which don’t allow light to pass through them,
विकल्प
Transparent substance
Opaque substance
Translucent substances
Non-luminous substance
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उत्तर
Opaque substance
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संबंधित प्रश्न
What is light? Define it.
Differentiate between the luminous and non-luminous bodies. Give two examples of each.
Tick the correct answer.
Light causes
Fill in the blank
The brightness of light is measured in ...................
Write true or false
The earth has its own light.
Answer the following.
What is light?
Answer the following.
What is meant by luminous intensity? What is one lumen?
Write whether of the following objects are luminous or non-luminous.
| Object | Luminous/Non-luminous |
| A book | |
| A burning candle | |
| A wax cloth | |
| A pencil | |
| A pen | |
| A light bulb | |
| A tyre | |
| A torch |
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 |
