Answer to Question #38953 in Optics for Preet
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Dear Muskan, this problem can be solved in a following way. Observer will see the mirror closer due to refraction in glass slab. Let now consider this distance as 20 + x. On the other hand, image distance from the mirror should be the same and we can write as 22 + (10 - x). Now we can find that x = 6, and the real depth of the slab is 10. So we obtain the same answer n=10/6=1.67
Why we have add x to the thickness of glass slab and equate it to 22