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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 double-slit experiment, Light with a wavelength of 6000 Å is used, and the screen is placed 40 cm from the slits. If the fringe spacing is 0.012 cm, what is the distance between the two slits?
(A) 2.4 cm
(B) 0.24 cm
(C) 0.20 cm
(D) 0.024 cm
Option c – 0.20 cm
When the thickness ‘t’ of a thin film becomes large, what happens to the interference pattern?
(A) The alternate bright and dark fringes remain unaffected
(B) The separation between alternate bright and dark fringes increases, producing more colors
(C) The alternate bright and dark fringes come closer, resulting in a thick white appearance
(D) The alternate bright and dark fringes come closer, producing vivid colors
Option c – The alternate bright and dark fringes come closer, resulting in a thick white appearance
In Young’s experiment, using Light of wavelength 3000 Å produces 60 fringes in the visible range. If the wavelength is changed to 5000 Å, how many fringes will be observed in the same range?
(A) 40
(B) 53
(C) 36
(D) 90
Option c – 36
If two virtual coherent sources are used to create interference, what will be the nature of the resulting pattern?
(A) No interference will be observed
(B) The interference pattern will be unstable
(C) A stable interference pattern will form
(D) The interference will occur only at a specific point
Option c – A stable interference pattern will form
Light with a wavelength of 6200 Å strikes a plane reflective surface. What is the change in path length?
(A) 5400 Å
(B) 4500 Å
(C) 3100 Å
(D) Zero
Option c – 3100 Å
In a double-slit setup, the angular fringe width is 0.10° when sodium Light of wavelength 5000 Å is used. What change in wavelength is needed to increase the angular fringe width by 20%?
(A) Increase by 1000 Å
(B) Decrease by 1000 Å
(C) Increase by 500 Å
(D) No change required
Option a – Increase by 1000 Å
A parallel monochromatic Light beam strikes a glass slab at a 60° angle. What is the ratio of the beam’s width in glass to its width in air? (µ = 1.5)
(A) 35°
(B) 48°
(C) 68°
(D) 26°
Option a – 35°
In Young’s experiment using monochromatic Light, a glass plate is inserted perpendicularly in the path of Light from one slit. What effect does this have on the interference pattern?
(A) Fringes disappear
(B) Fringe width increases
(C) Fringe width decreases
(D) Fringe width remains the same, but the pattern shifts
Option d – Fringe width remains the same, but the pattern shifts
A parallel Light beam falls on a glass slab at an incident angle of 60°. If the width ratio of the beam in glass to air is 1.2, what is the angle of refraction?
(A) 64°
(B) 53°
(C) 45°
(D) 36°
Option b – 53°
In a Young’s double-slit setup, Light with a wavelength of 600 nm and another unknown wavelength produce overlapping interference patterns. The central maxima coincide, and the 7th bright fringe of the known Light aligns with the 8th of the unknown. What is the unknown wavelength?
(A) 393.4 nm
(B) 442.5 nm
(C) 776.8 nm
(D) 525 nm
Option d – 525 nm
When a plane wavefront moves through a homogeneous isotropic medium, how does its radius of curvature change?
(A) It increases
(B) It decreases
(C) It remains infinite
(D) It stays constant
Option c – It remains infinite
What property of light changes upon reflection?
(A) Frequency
(B) Speed
(C) Wavelength
(D) Phase
Option d – Phase
Assertion: Light speed increases when moving from a denser to a rarer medium.
Reason: The energy of the wave increases in this transition.
(A) Both assertion and reason are true, and reason correctly explains the assertion
(B) Both are true, but reason is not the correct explanation
(C) Assertion is true, reason is false
(D) Both assertion and reason are false
Option c – Assertion is true, reason is false
Two monochromatic waves meet at a point with an optical path difference of 82.5 λ. If the path difference is 41.7 µm, what is the light’s wavelength and the type of interference?
(A) 5055 Å, destructive
(B) 5055 Å, constructive
(C) 8550 Å, destructive
(D) 8550 Å, constructive
Option a – 5055 Å, destructive
Light of wavelength 8000 Å passes through two pinholes 0.8 mm apart and forms fringes on a screen 1 m away. What is the distance between the 2nd and 6th bright fringes on the same side?
(A) 3.6 mm
(B) 4.0 mm
(C) 4.8 mm
(D) 5.2 mm
Option b – 4.0 mm
An extended light source forms what type of wavefront?
(A) Cylindrical
(B) Spherical
(C) Plane
(D) No wavefront
Option a – Cylindrical
What is observed when light reflects off a film with negligible thickness?
(A) The film appears dark
(B) The film appears bright
(C) A silvery appearance is seen
(D) The film looks colored
Option a – The film appears dark
When a wavefront travels from air into glass, what happens to the width of the wavefront?
(A) Incident wavefront is narrower than refracted
(B) Incident wavefront is wider than refracted
(C) Both have the same width
(D) Incident wavefront is twice as wide as refracted
Option a – Incident wavefront is narrower than refracted
Light of 8000 Å wavelength enters a medium with refractive index 2.5. What is its new wavelength in the medium?
(A) 4000 Å
(B) 3200 Å
(C) 6200 Å
(D) 6500 Å
Option b – 3200 Å
According to Huygens’ principle, the new wavefront position is determined by
(A) Primary wavelets
(B) Secondary wavelets
(C) wave normal
(D) The existing wavefront
Option b – Secondary wavelets
Two coherent beams of light with intensities 2I and 6I interfere. What are the maximum and minimum resultant intensities?
(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 visible interference is produced when light reflects off window glass.
Reason: Typical glass surfaces lack the optical flatness required to produce interference fringes.
(A) Both are true, and reason explains the assertion
(B) Both are true, but reason does not explain the assertion
(C) Assertion is true, reason is false
(D) Both are false
Option b – Both are true, but reason does not explain the assertion
Two interfering light waves vibrate in mutually perpendicular planes but move along the same direction. What is the result?
(A) A stable interference pattern is formed
(B) No sustained interference occurs
(C) Only colored interference appears
(D) Alternating maxima and minima appear randomly
Option b – No sustained interference occurs
What does fringe width refer to in the context of wave Optics?
(A) Distance from the slits to the screen
(B) Distance between the two slits
(C) Distance between a bright and a dark point
(D) Distance between two consecutive bright fringes
Option d – Distance between two consecutive bright fringes
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