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Optical Density

P, Q, R, and ...

Question

P, Q, R, and S are four media. They are arranged according to the speed of light in them as:
Q>P>S>R
Which medium has the least optical density?

A

P

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B

Q

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C

R

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D

S

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Solution

The correct option is B
Q

Less the optical density, more the speed of light in the medium and vice versa.

Here, the speed of light in medium Q is highest,
So it has the least optical density.

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