Question

The refractive index of air to glass is 3/2, than the refractive index of glass to air is

a) 1/3

b) 4/5

c) 4/6

d) 5/2

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Answer 1

The ans should be 2/3...

but the option is not given!!

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Answer 2

Answer:

give some proper option the answer is 2/3 and it is not mentioned dear