Huygens' wave theory allows us to know the:

 1 Wavelength of the wave. 2 Velocity of the wave. 3 Amplitude of the wave. 4 Propagation of wavefront.

Subtopic:  Huygens' Principle |
84%
From NCERT
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When the light diverges from a point source, the shape of the wavefront is:

1. Parabolic.

2. Plane.

3. Spherical.

4. Elliptical.

Subtopic:  Huygens' Principle |
83%
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By Huygen's wave theory of light, we cannot explain the phenomenon of:

 1 Interference 2 Diffraction 3 Photoelectric effect 4 Polarisation

Subtopic:  Huygens' Principle |
73%
From NCERT
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Which of the following is not true?

 1 The speed of light is dependent on the colour of the light. 2 The speed of violet light is less than the speed of the red light in glass. 3 The frequency of light never depends upon the property of the medium. 4 When the light diverges from a point source, the shape of the wavefront is plane.
Subtopic:  Huygens' Principle |
72%
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On superposition of two waves $$y_{1}=3sin\left ( \omega t-kx \right )$$ and $$y_{2}=4sin\left ( \omega t-kx+\frac{\pi }{2} \right )$$ at a point, the amplitude of the resulting wave will be:

1.  7

2.  5

3.  $\sqrt{7}$

4.  6.5

Subtopic:  Superposition Principle |
85%
From NCERT
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Two superposing waves are represented by the following equations:
$${\mathrm{y}_1=5 \sin 2 \pi(10 \mathrm{t}-0.1 \mathrm{x}), \mathrm{y}_2=10 \sin 2 \pi(10 \mathrm{t}-0.1 \mathrm{x}).}$$
Ratio of intensities $\frac{{\mathrm{I}}_{\mathrm{max}}}{{\mathrm{I}}_{\mathrm{min}}}$ will be:

1. 1
2. 9
3. 4
​​​​​​​4. 16

Subtopic:  Superposition Principle |
85%
From NCERT
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Next Hint
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Two sources with intensity Io and 4Io respectively interfere at a point in a medium. The maximum and the minimum possible intensity respectively would be:
1. 2Io, Io
2. 9Io, 2Io
3. 4Io, Io
4. 9Io, Io

Subtopic:  Superposition Principle |
84%
From NCERT
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Two light sources are said to be coherent when their:

 1 amplitudes are equal and have a constant phase difference. 2 wavelengths are equal. 3 intensities are equal. 4 frequencies are equal and have a constant phase difference.
Subtopic:  Superposition Principle |
75%
From NCERT
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In Young's double-slit experiment, the intensity of light at a point on the screen where the path difference is λ is K, (λ being the wavelength of light used). The intensity at a point where the path difference is λ/4 will be:

1. K

2. K/4

3. K/2

4. Zero

Subtopic:  Superposition Principle |
62%
From NCERT
AIPMT - 2014
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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 $\frac{3\mathrm{\pi }}{2}$ and 2$\mathrm{\pi }$ 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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