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प्रश्न
What do you understand by candle power?
उत्तर
To measure the brightness of light in comparison with the brightness of a candle. The unit of candle power is used.
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संबंधित प्रश्न
Write true or false of the following statement.
Light travels in a straight-line path.
Write true or false of the following statement.
A shadow is formed because light travels in a straight-line path.
Fill in the blank.
A medium which allows light to pass through it easily is called the ...................
Match the following columns
| Column A | Column B |
| a. Wooden block | i. new moon's day |
| b. Sun | ii. rectilinear propagation of light |
| c. Umbra | iii. opaque body |
| d. Eclipse | iv. luminous body |
| e. Solar eclipse | v. complete dark park |
How does light make an object visible?
Answer the following.
Distinguish between transparent, translucent, and opaque objects.
Answer the following.
List two transparent objects.
When light passes through a prism, it gets separated into ______ colours.
Speed of light in air is 3 × 108 m s–1 and the refractive index of a medium is 1.5. Find the speed of light in the medium.
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.
