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  4. A plane glass slab is kept over various colour letters, the letter which appears least raised is:

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Q. A plane glass slab is kept over various colour letters, the letter which appears least raised is:

BHUBHU 2005Ray Optics and Optical Instruments

Solution:

Maximum apparent depth means minimum raised from surface. We know that $ \mu =\frac{Real\text{ }depth}{Apparent\text{ }depth} $ Red colour has minimum value of refractive index and thus maximum value of apparent depth. Hence, it should be raised least.