Two parallel glass plates of index of refraction n are separated by an air film of thickness d. Light of wavelength λ in air, normally incident on the plates, is intensified on reflection when, for some integer m,
A) 2d = mλ.
B) 2d = mλ/n.
C) 2d = mnλ.
D) 2d = m + 1/2)λ.
E) 2nd = mλ /2.

Question

Two parallel glass plates of index of refraction n are separated by an air film of thickness d. Light of wavelength λ in air, normally incident on the plates, is intensified on reflection when, for some integer m,
A) 2d = mλ. 
B) 2d = mλ/n. 
C) 2d = mnλ. 
D) 2d = m + 1/2)λ. 
E) 2nd = mλ /2.

Quizplus · Accepted Answer

The Answer of  Two parallel glass plates of index of refraction n are separated by an air film of thickness d. Light of wavelength λ in air, normally incident on the plates, is intensified on reflection when, for some integer m,
A) 2d = mλ. 
B) 2d = mλ/n. 
C) 2d = mnλ. 
D) 2d = m + 1/2)λ. 
E) 2nd = mλ /2.

Two Parallel Glass Plates of Index of Refraction N Are