PHYSICS

JAMB 2017 - Question 38

Physics 2017 JAMB Past Questions - Question 38: The speed of light in air is 3 x 108ms^-1. If the refractive index of light from air-to-water is 4/3, then which of the following is the correct value of the speed of light in water?

Choose the correct answers from the options given.
The speed of light in air is 3 x 108ms^-1. If the refractive index of light from air-to-water is 4/3, then which of the following is the correct value of the speed of light in water?
A:
B:
C:
D:
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Correct Answer

B

Explanation

To find the speed of light in water, we can use the formula:

Speed of light in air / Refractive index of air-to-water = Speed of light in water

Given that the speed of light in air is 3 x 10^8 m/s and the refractive index of air-to-water is 4/3, we can substitute these values into the formula:

(3 x 10^8 m/s) / (4/3) = (3 x 10^8 m/s) * (3/4) = 2.25 x 10^8 m/s

Therefore, the correct value for the speed of light in water is 2.25 x 10^8 m/s.