The diagram shows the interference pattern formed by two coherent light source S

Question

The diagram shows the interference pattern formed by two coherent light source S_1 and S_2. The curves in full lines represent the crests and the curves in broken lines represent the troughs. Which of the following lines. A, B, C, D, or E, are antinodal lines? A) C B) B and D C) A and C D) A, C, and E Which of the following properties are common to water waves, sound waves, and light waves? A) refraction only B) diffraction only C) interference only D) all of the previous A light ray strikes a rectangular glass block with angle of incidence greater than zero, as shown in the diagram. Consider the various light rays that are reflected or transmitted by the glass block (labelled A, B, C, D, and E in the diagram). If lambda is the wavelength of the incident light ray, which ray undergoes a change of phase by lambda/20? A) A B) B C) C D) D

Explanation / Answer

22. In caase of constructive interference for wave pattern either thick lines meet thick lines or two thin lines meet to create pattern. The constructive interference points give the antinodes or anti-nodal lines. In this case for B an D two thick lines are meeting while for C two thin lines are meeting therefore we have three antinodal lines and they are B,C,D

23. D) all of the previous

24. B) the light ray B must have the phase change as the light is passing from glass medium to air and according to the question the incident ray made angle greater than zero. That means B makes an angle larger than critical angle in the glass-air interface.

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