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. d/n
B. dn
C. d/n−2
D. d(n−1)/n

Correct Answer: Option A

A. d/n

Explanation

n = R.d/A.d

R.d = R.d/n=d/n