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Inteference MCQ Level -2


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10 Questions MCQ Test Topic wise Tests for IIT JAM Physics | Inteference MCQ Level -2

Inteference MCQ Level -2 for Physics 2022 is part of Topic wise Tests for IIT JAM Physics preparation. The Inteference MCQ Level -2 questions and answers have been prepared according to the Physics exam syllabus.The Inteference MCQ Level -2 MCQs are made for Physics 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Inteference MCQ Level -2 below.
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Inteference MCQ Level -2 - Question 1

Two coherent monochromatic light beams of intensities l and 4I are superposed the maximum and minimum possible intensities in the resulting beam are :

Detailed Solution for Inteference MCQ Level -2 - Question 1


The correct answer is: 9l and l

Inteference MCQ Level -2 - Question 2

White light is used to illuminate the two slits in a young’s double slit experiment. The separation between the slit is b and the screen is at a distance d (>> b ) from the slits. At a point on the screen directly in front of one of the slits, certain wavelengths are missing. Some of these missing wavelengths are :

Detailed Solution for Inteference MCQ Level -2 - Question 2

Clearly at Q, path difference = 5 sin θ


Now whenever  will be odd multiple of  , 
will be having minima at point Q. 

The correct answer is: 

Inteference MCQ Level -2 - Question 3

The distance of nth bright fringe to the (n + 1) dark fringe in Young’s experiment is equal to :

Detailed Solution for Inteference MCQ Level -2 - Question 3

The distance between nth bright fringe and ( n + 1)m dark fringe is equal to half fringe width 
The correct answer is: 

Inteference MCQ Level -2 - Question 4

A light of frequency 5 x 1014 Hz enters a medium of refractive index 1.5. In this medium, the velocity of light wave is.

Detailed Solution for Inteference MCQ Level -2 - Question 4


The correct answer is: 2 x 1010  cm/sec

Inteference MCQ Level -2 - Question 5

Ratio of intensities of two light waves is given by 4 :1. The ratio of the amplitudes of the waves is :

Detailed Solution for Inteference MCQ Level -2 - Question 5


The correct answer is: 2 : 1

Inteference MCQ Level -2 - Question 6

In a Fresnel biprism experiment, the two positions of lens given separation between the slits as 16 cm and 9 cm respectively. What is the actual distance of separation?

Detailed Solution for Inteference MCQ Level -2 - Question 6

The correct answer is: 12 cm

Inteference MCQ Level -2 - Question 7

A thin oil film of refractive index 1.2 floats on the surface of water When a light of wavelength λ = 9.6 x 10-7 m falls normally on the film from air, then it appears dark when seen normally. The minimum change in its thickness for which it will appear bright in normally reflected light by the same light is :

Detailed Solution for Inteference MCQ Level -2 - Question 7

For normal incidence path difference between ray 1 and ray 2 is 2μ1t


For minimum thickness increment 

The correct answer is: 2 x 10-7

Inteference MCQ Level -2 - Question 8

A parallel beam of monochromatic light is used in a Young’s double slit experiment. The slits are separated by a distance d and the screen is placed parallel to the plane of the slits. If the incident beam makes an angle  with the normal to the plane of the slits, find the intensity of the geometrical centre p0.

Detailed Solution for Inteference MCQ Level -2 - Question 8

Clearly at 0, no difference of path due to inside motion of rays.
Only path difference = S1,Q

⇒ destructive interference and hence

The correct answer is: 0

Inteference MCQ Level -2 - Question 9

If one of the slits of a standard Young’s double slit experiment is covered by a thin parallel sided glass slab so that it transmits only one half the light intensity of the other, then :

Detailed Solution for Inteference MCQ Level -2 - Question 9

Inteference MCQ Level -2 - Question 10

A young’s double slit experiment is performed with white light: 

Detailed Solution for Inteference MCQ Level -2 - Question 10

The correct answer is: There will not be a completely dark fringe

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