Optics 2 Question 9

9. A ray of light is incident at the glass-water interface at an angle i, it emerges finally parallel to the surface of water, then the value of μg would be

(2003,2M)

(a) (4/3)sini

(b) 1/(sini)

(c) 4/3

(d) 1

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Answer:

Correct Answer: 9. (b)

Solution:

  1. Applying Snell’s law (μsini= constant )

at 1 and 2 , we have

μ1sini1=μ2sini2

Here,

μ1=μglass ,i1=iμ2=μair =1 and i2=90

μgsini=(1)(sin90) or μg=1sini



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