Question

25. 2063 Q.NO. 7 Light from a luminous point on the lower face of a rectangular glass slab, 2 cm. thick, strikes the upper face and the totally reflected rays outline a circle of 3.2 cm. radius on the lower face. What is refractive index of the glass? Ans: 1.6 [4]

solve it​

Answer 1

Answer:

1.6

Explanation:

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Answer 2

Answer:

Explanation:first usind snells law,

refractive index od air with respect to glass[gUa] = sin c / sin 90

that will be gUa = sinc /1............................................1

now taking the triangle for finding value of c

using tanc=perpendicular/ base

we get c= 57.99

now putting value of c in eqn 1 , we get

gUa = 0.848

we need refractive index of glass so we need to reciprocal it,

aUg=1.179