11. A point source of light placed in a homogeneous medium gives rise to
A. A cylindrical wavefront
B. An elliptical wavefront
C. A spherical wavefront
D. A plane wavefront
12. The locus of all points in a medium having the same phase of vibration is called
A. Crest
B. Trough
C. Wavelength
D. Wavefront
13. Which one of the following is nearly monochromatic light?
A. Light form fluorescent tube
B. Light form neon lamp
C. Light form sodium lamp
D. Light form simple lamp
14. Two sources of light are coherent if they emit rays of
A. Same wavelength
B. The same amplitude of vibration
C. Same wavelength with a constant phase difference
D. Same amplitude and wavelength
15. When the crest of one wave falls over the trough of the other wave this phenomenon is known as
A. Polarization
B. Constructive interference
C. Destructive interference
D. Diffraction
16. In Young’s double slit experiment the fringe spacing is equal to
A. dλD
B. 2λd/D
C. λD/d
D. λd/D
17. In Young double slit experiment, if white light is used
A. Alternate dark and bright fringes will be seen
B. Coloured fringes will be seen
C. No interference fringes will be seen
D. Impossible to predict
18. The velocity of light was determined accurately by
A. Newton
B. Michelson
C. Huygen
D. Young
19. The condition for constructive interference of two coherent beams is that the path difference should be
A. Integral multiple of λ/2
B. Integral multiple of λ
C. Odd integral multiple of λ/2
D. Even integral multiple of λ
20. In an interference pattern
A. Bright fringes are wider than dark fringes
B. Dark fringes are wider than a bright fringe
C. Both dark and bright fringes are of equal width
D. Central fringes are brighter than the outer fringes
Click On Below Page Numbers To Go To Next/Previous Page of Physical Optics MCQs