science
Grade-7
Easy
Question
When light traveling in glass enters the air, its speed becomes ___ m/s.
- 3 x 108
- 2 x 108
- 1 x 108
- 1.5 x 108
Hint:
The speed is same as in vacuum.
The correct answer is: 3 x 108
The correct answer is a)3x108m/s.
The speed of light in air and vacuum is same. The speed of light in air is 1.0003 times slow and therefore is negligible and is considered same as speed of light in vacuum. The speed of light is more in rarer medium. When light travels from glass (denser medium) the speed is 2x108 m/s. The speed increases in air(rarer medium)
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