INSIGHT UPSC QUIZ

Science & Technology General Science
Q.

 In the context of nature of light, read the following statements carefully: 

1. Light does not travel in the same direction in all mediums. 

2. Light propagates with different speeds in different mediums. 

3. Light travels fastest in air with speed of 3×108 m/s. 

4. Speed of light reduces considerably in glass or water.

Which of the statements given above is/are correct?

Explanation:

ANSWER: (D)

  • Light does not travel in the same direction in all media. It appears that when travelling obliquely from one medium to another, the direction of propagation of light in the second medium changes. (Thus, Statement 1 is correct) 
  • Light propagates with different speeds in different media. (Thus, Statement 2 is correct)
  • Light travels fastest in air with speed of 3×10^8 m/s. (Thus, Statement 3 is not correct)
  • In air, the speed of light is only marginally less, compared to that in vacuum. It reduces considerably in glass or water. (Thus, Statement 4 is correct)

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