The intensity of the polarized light becomes 1a times its initial intensity. The angle between the axis of analyzer and polarizer is

1.  θ = tan-1a-1

2.  θ = tan-11a

3.  θ = sin-1a-1

4.  θ = sin-11a

Subtopic:  Polarization of Light |
From NCERT
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Which statement is true for interference?

1. Two independent sources of light can produce interference pattern.
2. There is no violation of conservation of energy.
3. White light cannot produce interference.
4. The interference pattern can be obtained even if coherent sources are widely apart.

Subtopic:  Superposition Principle |
 55%
From NCERT
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In Y.D.S.E., if the intensity ratio of bright and dark fringes is 81: 25. The ratio intensity of two waves is

1.  1: 49

2.  49: 4

3.  1: 4

4.  4: 40

Subtopic:  Young's Double Slit Experiment |
 84%
From NCERT
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Two monochromatic waves each of amplitude A have a phase difference π2 between them. When they superimpose, the amplitude of the resultant wave is

1.  2A

2.  Zero

3.  4A

4.  A2

Subtopic:  Superposition Principle |
 77%
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A screen is placed 100 cm from a single slit which is illuminated with 5000 Ao light. If the distance between the first and third minima in the diffraction pattern is 5 mm. The width of the slit is

1.  2 mm

2.  0.2 μm

3.  2 ×10-4 m

4.  4 ×10-5 m

Subtopic:  Diffraction |
 75%
From NCERT
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When the light of a certain wavelength is incident on a plane surface of a material of a glancing angle 30°, the reflected light is polarised. The angle of refraction is

1.  60°

2.  30°

3.  45°

4.  40°

Subtopic:  Polarization of Light |
From NCERT
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In a double-slit experiment, the distance between the slit is d. The screen is at a distance D from the slits and λ is the wavelength of light used. If a dark fringe is formed opposite to a slit on the screen, the order of fringe is

1.  d2+λD2λD

2.  -D+d2λ

3.  +d2D

4.  D2+2λ

Subtopic:  Young's Double Slit Experiment |
 59%
From NCERT
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In Y.D.S.E., if a liquid is filled between the space of the screen and slit, then

1.  Central bright fringe will shift upward.

2.  Central bright fringe will not shift.

3.  Central bright fringe will shift downward.

4.  Central fringe may shift downward or upward.

Subtopic:  Young's Double Slit Experiment |
 60%
From NCERT
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In Y.D.S.E. if the width of the slits is gradually decreased, then

1.  Bright fringe will become brighter and dark fringe becomes darker.

2.  Bright fringe becomes less bright and dark fringe becomes less dark.

3.  Bright fringe becomes brighter and dark fringe becomes lighter.

4.  Bright fringe becomes less bright and dark fringe becomes darker.

Subtopic:  Young's Double Slit Experiment |
From NCERT
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Light waves of intensities \(I\) and \(9I\) interfere to produce a fringe pattern on a screen. The phase difference between the waves at point P is 3π2 and 2π at other point Q. The ratio of intensities at P and Q is:

1.  8: 5

2.  5: 8

3.  1: 4

4.  9: 1

Subtopic:  Superposition Principle |
 60%
From NCERT
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