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A ray of light from a monochromatic poin...

A ray of light from a monochromatic point source of light is incident at a point on the screen. If a thin mica film of thickness t annd refractive index n is introduced in its path, then the optical path

A

is increased by (n-1)t

B

is decreased by (n-1) t

C

is not affected

D

is increased by (n+1)t

Text Solution

Verified by Experts

The correct Answer is:
A

Optical path=nt
`therefore`Total path=`(d-t)+nt=d+(n-1)t`
It is increased by (n-1)t.
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