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A plane glass...

Question

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

A

Red

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B

Blue

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C

Green

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D

Violet

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Solution

The correct option is A Red
Refractive index of the liquid(µ) = $\frac{r e a l d e p t h}{a p p a r e n t d e p t h} = \frac{h}{h'}$

$h^{'} \propto \frac{1}{μ}$
$μ_{R} < μ_{V} h'_{R} > h'_{V}$

Red colour letter appears least raised

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