Physical Optics — Physics MCQs (Class 11)
Free chapter-wise Physics MCQs with answers for MDCAT, FSc and entry tests.
Page 5 of 17
#33 If one of the slits in Young's experiment is covered, the pattern on the screen becomes:
A) A sharper interference pattern
B) A diffraction pattern from a single slit
C) Completely dark
D) Completely bright
#34 The fringe width in Young's experiment is the distance between:
A) Two consecutive bright fringes
B) Two consecutive dark fringes
C) The first bright and the first dark fringe
D) Any two consecutive fringes (either bright or dark)
#35 The condition for the first secondary maximum in a single-slit diffraction pattern is approximately:
A) \( a \sin\theta = \lambda \)
B) \( a \sin\theta = \frac{3\lambda}{2} \)
C) \( a \sin\theta = 2\lambda \)
D) \( a \sin\theta = \frac{\lambda}{2} \)
#36 A polarizer:
A) Converts unpolarized light into polarized light
B) Converts polarized light into unpolarized light
C) Increases the intensity of light
D) Decreases the wavelength of light
#37 Brewster's law is given by \( \mu = \tan i_p \). At this angle, the reflected light is:
A) Unpolarized
B) Partially polarized
C) Completely plane-polarized
D) Circularly polarized
#38 Which of the following is not a necessary condition for two light sources to be coherent?
A) Same wavelength
B) Same frequency
C) Constant phase relationship
D) Same amplitude
#39 In a diffraction grating, the number of orders of spectra that can be seen is limited by the fact that \( \sin\theta \) cannot exceed:
A) 0
B) 0.5
C) 1
D) 2
#40 The critical angle for a medium depends on:
A) The wavelength of light only
B) The refractive indices of both media
C) The angle of incidence only
D) The polarization of light
Page 5 of 17
Register or Login for comments
Comments: