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प्रश्न
Answer the following.
What is meant by luminous intensity? What is one lumen?
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उत्तर
The measurement of the brightness of the light is called luminous intensity.
One lumen is considered to 1 / 1256 th of candle power.
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संबंधित प्रश्न
Fill in the blank.
Light gives us the sensation of ................
Fill in the blank.
Light travels in a ................. path.
Name two natural sources of light.
Differentiate between the luminous and non-luminous bodies. Give two examples of each.
What do we call a substance through which we cannot see light? Give an example of such a substance.
Fill in the blank
The brightness of light is measured in ...................
_______ is the natural source that stimulates sight and makes things visible.
When a beam of white light passes through a prism it gets ______.
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.
