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Light Reflection and Refraction
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01/12/2020 12:21 pm
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A light ray enters from medium A to medium B as shown in figure. The refractive index of medium B relative to A will be
(a) greater than unity
(b) less than unity
(c) equal to unity
(d) zero
1 Answer
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01/12/2020 12:25 pm
(b) less than unity
Explanation:
In medium B, light ray bends away from the normal. It indicates that medium B is optically rarer than medium A. Hence speed of light in medium B is more than that in medium A.
Now, refractive index
AnB = vA/vB
As vB > vA
⇒ vB/vA
∴ AnB < 1