With the increase in wavelength of the interfering beam, the fringe width in Young's double-slit experiment: 
1. decreases 
2. increases 
3. remains the same 
4. can increase or can decrease
Subtopic:  Young's Double Slit Experiment |
 85%
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Given below are two statements: 

Assertion (A): In Young's double-slit experiment the two slits are at a distance apart. The interference pattern is observed on a screen at a distance D from the slits and a dark fringe is observed. The wavelength of the wave is proportional to the square of the distance between two slits.
Reason (R): For a dark fringe, intensity is zero.
  
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Young's Double Slit Experiment |
From NCERT
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Given below are two statements:

Assertion (A): It is not possible to have interference between the waves produced by two violins. 
Reason (R): For interference of two waves the phase difference between the waves must remain constant.Given below are two statements.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Superposition Principle |
 68%
From NCERT
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Given below are two statements: 

Assertion (A): To observe the diffraction of light the size of the obstacle/aperture should be of the order of 10-7 m.
Reason (R): 10-7 m is the order of the wavelength of visible light.
  
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Diffraction |
 75%
From NCERT
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Given below are two statements: 
Assertion (A): Radio waves can be polarised.
Reason (R): Sound waves in air are longitudinal in nature.
 
1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True but (R) is not the correct explanation of (A).
3. (A) is True but (R) is False.
4. Both (A) and (R) are False.
Subtopic:  Polarization of Light |
 76%
From NCERT
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Two Sources S1 and S2 of intensity I1 and l2 are in front of a screen [Fig.(a)]. The pattern of intensity distribution seen in the central portion is given by Fig.(b).

            

In this case, which of the following statements are true?

(a) S1and S2 have the same intensities
(b) S1and S2 have a constant phase difference
(c) S1and S2 have the same phase
(d) S1and S2 have the same wavelength 

1. (a, b, c)

2. (a, b, d)

3. (b, c, d)

4. (c, d)

Subtopic:  Superposition Principle |
 53%
From NCERT
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Consider sunlight incident on a pinhole of width 103 A. The image of the pinhole seen on a screen shall be:

(a) a sharp white ring
(b) different from a geometrical image
(c) a diffused central spot, white in colour
(d) diffused coloured region around a sharp central white spot

1. (a, c)

2. (a, d)

3. (b, d)

4. (b, c)

Subtopic:  Diffraction |
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Consider the diffraction pattern for a small pinhole. As the size of the hole is increased:

(a) the size decreases
(b) the intensity increases
(c) the size increases
(d) the intensity decreases

1. (a, b)

2. (a, c)

3. (b, d)

4. (c, d)

Subtopic:  Diffraction |
 57%
From NCERT
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For light diverging from a point source:

(a) the wavefront is spherical.
(b) the intensity decreases in proportion to the distance squared.
(c) the wavefront is parabolic.
(d) the intensity at the wavefront does not depend on the distance.

Choose the correct option:
 
1. (a), (b)
2. (a), (c)
3. (b), (c)
4. (c), (d)

Subtopic:  Huygens' Principle |
 83%
From NCERT
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White light is used to illuminate the double slit in Young's double-slit experiment. Which of the following is/are true? 
I. The central fringe will be white.
II. Closest bright fringe to the central fringe will be a violet fringe.
III. There will not be any dark fringe.

1. I only 
2. I, II
3. I, III
4. I, II, III
Subtopic:  Young's Double Slit Experiment |
From NCERT
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