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प्रश्न
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 |
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उत्तर
| Column A | Column B |
| a. Wooden block | iii. opaque body |
| b. Sun | iv. luminous body |
| c. Umbra | v. complete dark park |
| d. Eclipse | ii. rectilinear propagation of light |
| e. Solar eclipse | i. new moon's day |
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संबंधित प्रश्न
Match the following
| (a). A light ray passes from air to glass | (1) . speeds up |
| (b). A light ray passes from glass to water | (2). reflects red light |
| (c). Virtual image | (3). primary colours |
| (d). Red rose | (4). plane mirror |
| (e). Red, green, and blue | (5). slows down |
What do we call an electric bulb producing light?
Name any four man made sources of light.
Write the names of some cold light-emitting objects.
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 |
Mirrors change the direction of light that fall on them.
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.
State whether the following statement is True or False.
An object can be seen only if it emits light
Using a pinhole camera a student observes the image of two of his friends, standing in sunlight, wearing yellow and red shirt respectively. What will be the colours of the shirts in the image?
