A wedge-shaped film of air is formed by placing a glass plate on second flat glass plate. The wedge is then illuminated using a monochromatic light from above and a fringe pattern is shown. From the fringe pattern one can conclude that the surface of the first glass plate is
A) much flatter than the wavelength used.
B) flat on the left side but then has a concave to the right side.
C) flat on the left side but then has a convex to the right side.
D) flat on the right side but then has a concave to the left side.
E) flat on the right side but then has a convex to the left side.

Question

A wedge-shaped film of air is formed by placing a glass plate on second flat glass plate. The wedge is then illuminated using a monochromatic light from above and a fringe pattern is shown. From the fringe pattern one can conclude that the surface of the first glass plate is
A) much flatter than the wavelength used. 
B) flat on the left side but then has a concave to the right side. 
C) flat on the left side but then has a convex to the right side. 
D) flat on the right side but then has a concave to the left side. 
E) flat on the right side but then has a convex to the left side.

Quizplus · Accepted Answer

The Answer of  A wedge-shaped film of air is formed by placing a glass plate on second flat glass plate. The wedge is then illuminated using a monochromatic light from above and a fringe pattern is shown. From the fringe pattern one can conclude that the surface of the first glass plate is
A) much flatter than the wavelength used. 
B) flat on the left side but then has a concave to the right side. 
C) flat on the left side but then has a convex to the right side. 
D) flat on the right side but then has a concave to the left side. 
E) flat on the right side but then has a convex to the left side.

A Wedge-Shaped Film of Air Is Formed by Placing a Glass