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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:

JIPMERJIPMER 2006Ray Optics and Optical Instruments

Solution:

Refractive index
$ \mu =\frac{\text{real depth}}{\text{apparent depth}} $
For red colour, refractive index is minimum, i.e., it will have maximum apparent depth and hence, appears least raised.