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A rectangular glass prism of thickness d and absolute refrac...

A rectangular glass prism of thickness d and absolute refractive index n is placed on a point object which is viewed vertically downward from above the prism. Which of the following expressions correctly defines the apparent upward displacement of the object?

A.

dn

B.

dn

C.

dn2

D.

d(n1)n

Correct answer is A

n = R.dA.d

R.d = R.dn=dn