NEET 2000 Physics question

A bubble in glass slab () when viewed from one side appears at 5 cm and 2 cm from other side, then thickness of slab is :

(1)
(2)
(3)Correct
(4)

Answer: (3)

Solution

Let the slab have thickness and the bubble be at real distance from the first face; then it is from the second face. Looking in normally, apparent depth real depth. Viewed from the first side: , so . Viewed from the

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Question ID VK-088583