Light enters from air into a glass plate having refractive index 1.5. What is the speed of light in glass? (Speed of light in vacuum is 3 × 108ms-1) (Ans: 2 × 108ms-1)
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u ( refractive index) = (speed in vacuum)
/ (speed in medium)
u =( 3×10^8 ms^-1 )/ ( speed in glass )
speed in glass = (3×10^8)/ (1.5)
= 2×10^8 ms^-1
/ (speed in medium)
u =( 3×10^8 ms^-1 )/ ( speed in glass )
speed in glass = (3×10^8)/ (1.5)
= 2×10^8 ms^-1
Answered by
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Answer:
2×10^8 m/s.
Explanation:
If we take the refractive index of the glass to be µ which is given in the question as 1.5. The speed of the light is also given in the question as 3*10^8 m/s.
So, we know that the refractive index is given by the formulae of µ= speed of the light in vacuum/speed of the light in medium.
µ=3×10^8/speed of the light in glass.
So, on solving we will get the speed of the light in glass = (3×10^8)/ (1.5)= 2×10^8 m/s.
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