Waves Optics  MCQs

MCQs of Waves Optics

Showing 21 to 30 out of 131 Questions
21.
The ratio of phase difference and path difference is _____
(a) 2π
(b) 2πλ
(c) λ2π
(d) πλ
Answer:

Option (b)

22.
The correct relation between time interval ∂ and phase difference δ is _____
(a) =T2πδ
(b) =2πTδ
(c) =2πδ
(d) =δ2π
Answer:

Option (a)

23.
The resultant amplitude in interference with two coherent sources depends upon _____
(a) intensity
(b) only phase difference
(c) Both (A) and (B)
(d) None of the above
Answer:

Option (c)

24.
The necessary condition for stationary interference pattern of light is that light source should be _____
(a) of same amplitude, frequency, constant phase difference and of the same state of polarization
(b) of same amplitude, frequency, but with varying phase difference and of same state of polarization
(c) of same frequency, constant phase difference and of same state of polarization
(d) of same amplitude, different frequency, constant phase difference and of the same state of polarization
Answer:

Option (a)

25.
In the phenomenon of interference, energy is _____
(a) destroyed at bright fringes
(b) created at dark fringes
(c) same at all points
(d) conserved, but it is redistributed
Answer:

Option (d)

26.
The equation for two waves obtained by two light sources are given below: e1=E1sin 3ωt, e2=E2cos3ωt+π6 .What will be the value of the phase difference at time t ?
(a) 3π2
(b) 2π3
(c) π
(d) π2
Answer:

Option (b)

27.
In a Young's double slit experiment, if the slits are of unequal width _____
(a) fringes will not be formed
(b) the positions of minimum intensity will not be completely dark
(c) bright fringe will not be formed at the centre of the screen
(d) distance between two consecutive bright fringe will not be equal to the distance between two consecutive dark fringes.
Answer:

Option (b)

28.
In Young's double slit experiment with monochromatic light the central fringe will be _____.
(a) colored
(b) white
(c) bright
(d) black
Answer:

Option (c)

29.
Green light of wavelength 5100 Å from a narrow slit is incident on a double slit. If the overall separation of 10 fringes on a screen 200 cm away is 2 cm, then distance between the slits is _____
(a) 2.5 × 10-4 m
(b) 5.1 × 10-4 m
(c) 7.3 × 10-4 m
(d) 9.7 × 10-4 m
Answer:

Option (b)

30.
The angular spread of central maximum in a diffraction pattern, does not depend on _____.
(a) the distance between the slit and sources
(b) wavelength of light
(c) width of slit
(d) frequency of light
Answer:

Option (a)

Showing 21 to 30 out of 131 Questions