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Apparent Depth

To a bird in ...

Question

To a bird in air a fish in water appears to be 30cm from its surface if ^au_w =4/3 then the true depth of fish is:

30cm

40cm

45cm

None of these

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Solution

Refractive index =real depth/apparent depth
4/3=real depth /30
(430)/3=real depth
Real depth=410=40cms

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