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प्रश्न
Can light travel in vacuum?
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उत्तर
Yes, light can travels in vacuum or air, a distance of nearly 299, 792, 458 metre (or nearly 3 × 108 metre) in one second. Thus, the speed of light in vacuum (or air) is 3 x 108 m s’1 nearly.
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संबंधित प्रश्न
Fill in the blank.
Moon is a .................. body.
Select the correct alternative.
The luminous body is
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?
Name a few living things which emit light.
Match the following
| Column A | Column B |
| 1. Transparent object | i. Football |
| 2. Eclipses | ii. Glass |
| 3. Translucent object | iii. Fluorescent tube |
| 4. Luminous object | iv. Tracing paper |
| 5. Non - luminous object | v. Shadows |
Write true or false
The stars have no light.
Light is a form of ______.
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.
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?
