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31 Year NEET Previous Year Questions: Wave Optics - NEET MCQ


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21 Questions MCQ Test Physics Class 12 - 31 Year NEET Previous Year Questions: Wave Optics

31 Year NEET Previous Year Questions: Wave Optics for NEET 2024 is part of Physics Class 12 preparation. The 31 Year NEET Previous Year Questions: Wave Optics questions and answers have been prepared according to the NEET exam syllabus.The 31 Year NEET Previous Year Questions: Wave Optics MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for 31 Year NEET Previous Year Questions: Wave Optics below.
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31 Year NEET Previous Year Questions: Wave Optics - Question 1

Which one of the following phenomena is notexplained by Huygen’s construction ofwavefront? [1988]

Detailed Solution for 31 Year NEET Previous Year Questions: Wave Optics - Question 1

Huygen's construction of wavefront does not apply to origin of spectra which is explained by quantum theory

31 Year NEET Previous Year Questions: Wave Optics - Question 2

Which of the following phenomenon is notcommon to sound and light waves ?      [1988]

Detailed Solution for 31 Year NEET Previous Year Questions: Wave Optics - Question 2

Sound waves can not be polarised as they are longitudinal. Light waves can be polarised as they are transverse.

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31 Year NEET Previous Year Questions: Wave Optics - Question 3

Interference is possible in [1989]

Detailed Solution for 31 Year NEET Previous Year Questions: Wave Optics - Question 3

Interference is a wave phenomenon shown by both the light waves and sound waves.

31 Year NEET Previous Year Questions: Wave Optics - Question 4

The Young’s double slit experiment is performed with blue and with green light of wavelengths 4360Å and 5460Å respectively. If x is the distance of 4th maxima from the central one, then           [1990]

Detailed Solution for 31 Year NEET Previous Year Questions: Wave Optics - Question 4

Distance of nth maxima, 

31 Year NEET Previous Year Questions: Wave Optics - Question 5

In Young’s double slit experiment, the fringe width is found to be 0.4 mm. If the whole apparatus is immersed in water of refrative index  4/3, without disturbing the geometrical arrangement, the new fringe width will be [1990]

Detailed Solution for 31 Year NEET Previous Year Questions: Wave Optics - Question 5

31 Year NEET Previous Year Questions: Wave Optics - Question 6

In Young’s experiment, two coherent sources areplaced 0.90 mm apart and fringe are observedone metre away. If it produces second dark fringeat a distance of 1 mm from central fringe, thewavelength of monochromatic light used wouldbe               [1991, 1992]

Detailed Solution for 31 Year NEET Previous Year Questions: Wave Optics - Question 6

For dark fringe

λ = 0.6x10-6 m = 6 × 10–5 cm

31 Year NEET Previous Year Questions: Wave Optics - Question 7

Ratio of intensities of two waves are given by 4 : 1. Then the ratio of the amplitudes of the twowaves is   [1991]

Detailed Solution for 31 Year NEET Previous Year Questions: Wave Optics - Question 7

31 Year NEET Previous Year Questions: Wave Optics - Question 8

In Young’s double slit experiment carried out withlight of wavelength (λ) = 5000Å, the distancebetween the slits is 0.2 mm and the screen is at 200 cm from the slits. The central maximum is at x = 0. The third maximum (taking the central maximum as zero th maximum) will be at x equal to           [1992]

Detailed Solution for 31 Year NEET Previous Year Questions: Wave Optics - Question 8

31 Year NEET Previous Year Questions: Wave Optics - Question 9

If yellow light emitted by sodium lamp in Young’s double slit experiment is replaced by a monochromatic blue light of the same intensity        [1992]

Detailed Solution for 31 Year NEET Previous Year Questions: Wave Optics - Question 9

As 

∴ Fringe width β will decrease

31 Year NEET Previous Year Questions: Wave Optics - Question 10

Interference was observed in interferencechamber where air was present, now the chamberis evacuated, and if the same light is used, acareful observer will see           [1993]

Detailed Solution for 31 Year NEET Previous Year Questions: Wave Optics - Question 10

In vaccum, λ increases very slightly compared to that in air. As β∝ λ , therefore, width of interference fringe increases slightly.

31 Year NEET Previous Year Questions: Wave Optics - Question 11

A parallel beam of monochromatic light ofwavelength 5000Å is incident normally on asingle narrow slit of width 0.001 mm. The light isfocussed by a convex lens on a screen placed infocal plane. The first minimum will be formed forthe angle of diffraction equal to        [1993]

Detailed Solution for 31 Year NEET Previous Year Questions: Wave Optics - Question 11

For first minimum, a sin θ = nλ = 1λ

31 Year NEET Previous Year Questions: Wave Optics - Question 12

In a Fresnel biprism experiment, the two positionsof lens give separation between the slits as 16cm and 9 cm respectively. What is the actualdistance of separation?    [1996]

Detailed Solution for 31 Year NEET Previous Year Questions: Wave Optics - Question 12

Separation between slits are (r1=) 16 cm and (r2=) 9 cm.
Actual distance of separation

31 Year NEET Previous Year Questions: Wave Optics - Question 13

Colours appear on a thin soap film and on soapbubbles due to the phenomenon of [1999]

Detailed Solution for 31 Year NEET Previous Year Questions: Wave Optics - Question 13

We know that the colours for which the
condition of constructive interference is
satisfied are observed in a given region of the film. The path difference between the light waves reaching the eye changes when the position of the eye is changed. Therefore, colours appear on a thin soap film or soap bubbles due to the phenomenon of interference.

31 Year NEET Previous Year Questions: Wave Optics - Question 14

Which of the following shows particle nature oflight?      [2001]

Detailed Solution for 31 Year NEET Previous Year Questions: Wave Optics - Question 14

Photoelectric effect shows particle nature of light as light consists of packets of energy called photons or quanta

31 Year NEET Previous Year Questions: Wave Optics - Question 15

A paper, with two marks having separation d, isheld normal to the line of sight of an observer ata distance of 50m. The diameter of the eye-lensof the observer is 2 mm. Which of the followingis the least value of d, so that the marks can beseen as separate ? The mean wavelength ofvisible light may be taken as 5000 Å.     [2002]

Detailed Solution for 31 Year NEET Previous Year Questions: Wave Optics - Question 15

31 Year NEET Previous Year Questions: Wave Optics - Question 16

The periodic waves of intensities I1 and I2 pass through a region at the same time in the same direction. The sum of the maximum and minimum intensities is:

Detailed Solution for 31 Year NEET Previous Year Questions: Wave Optics - Question 16

We know that the resultant of two intensities with phase difference of angle a can be represented as, I = I1+ I2 + 2( I1.I2 )1/2. cos a
Thus we get Imax =  I1+ I2 + 2( I1.I2
And Imin =  I1+ I2 - 2( I1.I2
Thus we get the sum =  2( I1+ I2 )

31 Year NEET Previous Year Questions: Wave Optics - Question 17

A lens having focal length f and aperture of diameter d forms an image of intensity I. Aperture of diameter
2/d  in central region of lens is covered by a black paper. Focal length of lens and intensity of image now will be
respectively:

Detailed Solution for 31 Year NEET Previous Year Questions: Wave Optics - Question 17

By covering aperture, focal length does not change. But intensity is reduced by 1/4 times, as aperture diameter d/2 is covered.

∴ New focal length = f and intensity = 3I/4

31 Year NEET Previous Year Questions: Wave Optics - Question 18

In Young’s double slit experiment, the slits are 2 mmapart and are illuminated by photons of twowavelengths λ1 = 12000Å and λ2 = 10000Å. Atwhat minimum distance from the common centralbright fringe on the screen 2 m from the slit will abright fringe from one interference patterncoincide with a bright fringe from the other ?    [NEET 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Wave Optics - Question 18

∴ n1 λ1 = n2λ2
⇒ n1 × 12000 × 10–10 = n2 × 10000 × 10–10
or, n (12000 × 10–10) = (n + 1) (10000 × 10–10)
⇒n = 5

(∵ λ1 = 1200 x 10-10m;  λ2 = 10000 x 10-10m)

(∵ d = 2 mm and D = 2m)
= 5 × 12 × 10–4 m
= 60 × 10–4 m
= 6 × 10–3m = 6 mm

31 Year NEET Previous Year Questions: Wave Optics - Question 19

A parallel beam of fast moving electrons isincident normally on a narrow slit. A fluorescentscreen is placed at a large distance from the slit.If the speed of the electrons is increased, whichof the following statements is correct ?              [NEET 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Wave Optics - Question 19

Angular width, 

[For central maxima n = 1]
Hence, with increase in speed of
electrons angular width of central
maximum decreases.

31 Year NEET Previous Year Questions: Wave Optics - Question 20

In Young’s double slit experiment the distancebetween the slits and the screen is doubled. Theseparation between the slits is reduced to half.As a result the fringe width           [NEET Kar. 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Wave Optics - Question 20

Fringe width  

From question D' = 2D and d' = d/2

31 Year NEET Previous Year Questions: Wave Optics - Question 21

A parallel beam of light of wavelength λ is incident normally on a narrow slit. A diffraction pattern is formed on a screen placed perpendicular to the direction of the incident beam. At the second minimum of the diffraction pattern, the phase difference between the rays coming from the two edges of slit is       [NEET Kar. 2013]

Detailed Solution for 31 Year NEET Previous Year Questions: Wave Optics - Question 21

Conditions for diffraction minima are
Path diff. Δx = nλ and Phase diff. δφ = 2nπ
Path diff. = nλ = 2λ
Phase diff. = 2nπ = 4π (∵n = 2)

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