Assertion The resolving power of a telescope is more if the diameter of the objective lens is more. 

Reason Objective lens of large diameter collects more light.

1. Both the assertion and the reason are true and the reason is a correct explanation of the assertion
2. Both the assertion and reason are true but the reason is not a correct explanation of the assertion
3. Assertion is true but the reason is false
4. Both the assertion and reason are false

Subtopic:  Resolving Power of Optical Devices |
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With the increase in wavelength of the interfering beam, the fringe width in YDSE: 
1. Decreases 
2. Increases 
3. Remains same 
4. Either of (2) and (3) is possible 
Subtopic:  Young's Double Slit Experiment |
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Assertion: 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: For a dark fringe, intensity is zero.

1. Both the assertion and the reason are true and the reason is a correct explanation of the assertion.
2. Both the assertion and reason are true but the reason is not a correct explanation of the assertion.
3. Assertion is true but the reason is false.
4. Both the assertion and reason are false.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Young's Double Slit Experiment |
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Assertion: It is not possible to have interference between the waves produced by two violins. 

Reason: For interference of two waves the phase difference between the waves must remain constant.
1. Both the assertion and the reason are true and the reason is a correct explanation of the assertion.
2. Both the assertion and reason are true but the reason is not a correct explanation of the assertion.
3. Assertion is true but the reason is false.
4. Both the assertion and reason are false.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Superposition Principle |
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Assertion: To observe the diffraction of light the size of the obstacle/aperture should be of the order of 10-7 m.
Reason: 10-7 m is the order of the wavelength of visible light.
1. Both the assertion and the reason are true and the reason is a correct explanation of the assertion.
2. Both the assertion and reason are true but the reason is not a correct explanation of the assertion.
3. Assertion is true but the reason is false.
4. Both the assertion and reason are false.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Diffraction |
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Assertion: Radio waves can be polarised.
Reason: Sound waves in air are longitudinal in nature.
1. Both the assertion and the reason are true and the reason is a correct explanation of the assertion.
2. Both the assertion and reason are true but the reason is not a correct explanation of the assertion.
3. Assertion is true but the reason is false.
4. Both the assertion and reason are false.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Polarization of Light |
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Assertion (A): An electron microscope can achieve better resolving power than an optical microscope.

Reason (R): The de Broglie's wavelength of the electrons emitted from an electron gun is much less than the wavelength of visible light.

1. Both the assertion and the reason are true and the reason is a correct explanation of the assertion.
2. Both the assertion and reason are true but the reason is not a correct explanation of the assertion.
3. Assertion is true but the reason is false.
4. Both the assertion and reason are false.

Subtopic:  Resolving Power of Optical Devices |
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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 |
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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 |
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