Wave Optics MCQ Questions with Answers. We covered all the Wave Optics MCQ Questions with Answers in this post for free so that you can practice well for the exam.
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MCQ on Wave Optics for NEET Students
In Young’s experiment when the wavelength is used 6000 Å and the screen is 40 cm from the slits, the fringes are 0.012 cm wide. What is the distance between the slits?
(A) 2.4 cm
(B) 0.24 cm
(C) 0.20 cm
(D) 0.024 cm
Option c – 0.20 cm
In the thin film, if the thickness ‘t’ of the film is large then
(A) the alternate maxima and minima remain the same.
(B) the alternate maxima and minima will be separated more, giving rise to many colors.
(C) the alternate maxima and minima will come closer, giving rise to a thick white film.
(D) the alternate maxima and minima will come closer, giving rise to sharp colors.
Option c – the alternate maxima and minima will come closer, giving rise to a thick white film.
In Young’s experiment, if we use the light of wavelength 3000 Å we get 60 fringes in the field of view. The number of fringes we will get in the same field of view if we use the light of wavelength 5000 Å is
(A) 40
(B) 53
(C) 36
(D) 90
Option c – 36
If two coherent sources required for interference are virtual then
(A) interference is not observed.
(B) interference pattern will not be stable.
(C) interference pattern will be stable.
(D) interference will be unstable except at a point.
Option c – interference pattern will be stable.
Light of wavelength 6200 Å is incident on a plane reflecting surface. The change in its path length will be
(A) 5400 A
(B) 4500 A
(C) 3100 A
(D) zero
Option c – 3100 A
In the double slit experiment, the angular width of the fringes is 0.10° for the sodium light (λ = 5000 Å). In order to increase the angular width of the fringes by 20%, the necessary change in the wavelength is
(A) an increase of 1000 Å
(B) a decrease of 1000 Å
(C) an increase of 500 Å
(D) zero
Option a – an increase of 1000 Å
A parallel beam of monochromatic light is incident on a glass slab at an angle of 60°. The ratio of the width of the beam in glass to that in the air is (µg = 1.5)
(A) 35°
(B) 48°
(C) 68°
(D) 26°
Option a – 35°
In Young’s experiment, monochromatic light is used to illuminate the two slits A and B. Interference fringes are observed on a screen placed in front of the slits. Now if a thin glass plate is placed normally in the path of the beam coming from the slit
(A) the fringes will disappear.
(B) the fringe width will increase.
(C) the fringe width will decrease.
(D) there will be no change in the fringe width but the pattern shifts.
Option d – there will be no change in the fringe width but the pattern shifts.
A parallel beam of monochromatic light is incident on a glass slab at an angle of incidence 60°. It gives the ratio of the width of the beam in glass to that in the air as 1.2 The angle of refraction in glass is
(A) 64°
(B) 53°
(C) 45°
(D) 36°
Option b – 53°
A mixture of light, consisting of wavelength 600 nm and an unknown wavelength, illuminates Young’s slit and gives rise to two overlapping interference patterns on the screen. The central maximum of both lights coincides. Further, it is observed that the 7th bright fringe of known light coincides with the 8th bright fringe of unknown light. The unknown light has a wavelength of
(A) 393.4 nm
(B) 442.5 nm
(C) 776.8 nm
(D) 525 nm
Option d – 525 nm
When a plane wavefront propagates in a homogenous isotropic medium its radius of curvature is.
(A) increases.
(B) decreases.
(C) remains infinity.
(D) remains constant.
Option c – remains infinity.
Due to reflection, ……… of light changes.
(A) frequency
(B) speed
(C) wavelength
(D) phase
Option d – phase
Assertion: When light from a source travels from a denser to a rarer medium, its velocity increases. Reason: It happens because energy carried by the wave increases when a wave travels from a denser to a rarer medium.
(A) The assertion is True, Reason is True; Reason is a correct explanation for Assertion.
(B) The assertion is True, and Reason is True; Reason is not a correct explanation for Assertion.
(C) The assertion is True, Reason is False.
(D) The assertion is False, Reason is False.
Option c – The assertion is True, Reason is False.
The optical path difference between two monochromatic waves meeting at a point is 82.5 λ. If the path difference is 41.7 micrometers then the wavelength of light and type of interference is
(A) 5055 Å, destructive interference.
(B) 5055 Å, constructive interference.
(C) 8550 Å, destructive interference.
(D) 8550 Å, constructive interference.
Option a – 5055 Å, destructive interference.
By passing light of wavelength 8000 Å through two pin holes 0.8 mm apart, fringes are obtained at a distance of 1 m from the pin holes. The distance between the 2nd and 6th bright fringes on the same side of the central bright fringe will be
(A) 3.6 mm
(B) 4.0 mm
(C) 4.8 mm
(D) 5.2 mm
Option b – 4.0 mm
With an extended source of light ………
(A) cylindrical wavefront is formed
(B) spherical wavefront is formed
(C) plane wavefront is formed
(D) no wavefront is formed
Option a – cylindrical wavefront is formed
For a film of negligible thickness, reflected rays interfere and the film appears ………
(A) dark
(B) bright
(C) Silver
(D) colored
Option a – dark
When the wavefront travels from air to glass then,
(A) the width of the incident plane wavefront is smaller than the width of the refracted wavefront.
(B) width of the incident plane wavefront is greater than the width of the refracted wavefront.
(C) width of the incident plane wavefront is the same as that of the refracted wavefront.
(D) width of the incident plane wavefront is twice the refracted wavefront.
Option a – the width of the incident plane wavefront is smaller than the width of the refracted wavefront.
Light of wavelength 8000 Å in air enters a medium of refractive index 2.5. What is its wavelength in that medium?
(A) 4000 Å
(B) 3200 Å
(C) 6200 Å
(D) 6500 Å
Option b – 3200 Å
The new position of the wavefront can be found by using Huygen’s principle of ………
(A) primary wavelets
(B) secondary wavelets
(C) wave normal
(D) wavefront
Option b – secondary wavelets
Two coherent monochromatic light beams of intensities 2I and 6I are superposed. The maximum and minimum possible intensities in the resulting beam are
(A) 14.9I and 2I
(B) 5I and 0.3I
(C) 14.9I and 1.07I
(D) 9I and 0.3I
Option c – 14.9I and 1.07I
Assertion: No interference is seen when light reflects from the two surfaces of a window pane. Reason: The surface of most window glass is very different than that of the optically flat surface required to produce interference fringes.
(A) The assertion is True, Reason is True; Reason is a correct explanation for Assertion.
(B) The assertion is True, and Reason is True; Reason is not a correct explanation for Assertion.
(C) The assertion is True, Reason is False.
(D) The assertion is False, Reason is False.
Option b – The assertion is True, and Reason is True; Reason is not a correct explanation for Assertion.
There are two interfering waves one has vibrations in a vertical YZ plane and the other has vibrations in the XY plane. If both are traveling along the same X-axis then
(A) sustained interference will take place.
(B) no sustained interference will take place.
(C) colored interference is only possible.
(D) the interference of varying maxima and minima will occur.
Option b – no sustained interference will take place.
Fringe width is ( Wave Optics MCQ Questions with Answers )
(A) the distance between the screen and the slits.
(B) the distance between two slits.
(C) the distance between bright and dark a point.
(D) the distance between successive two bright points.
Option d – the distance between successive two bright points.
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