# If L is the coherence length and c the velocity of light, the coherent time is  (1) cL (2) $\frac{L}{c}$ (3) $\frac{c}{L}$ (4) $\frac{1}{Lc}$

Subtopic:  Huygens' Principle |
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For constructive interference to take place between two monochromatic light waves of wavelength λ, the path difference should be

(1) $\left(2n-1\right)\frac{\lambda }{4}$

(2) $\left(2n-1\right)\frac{\lambda }{2}$

(3) $n\lambda$

(d) $\left(2n+1\right)\frac{\lambda }{2}$

Subtopic:  Young's Double Slit Experiment |
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Soap bubble appears coloured due to the phenomenon of:

1. Interference

2. Diffraction

3. Dispersion

4. Reflection

Subtopic:  Superposition Principle |
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Which of the following statements indicates that light waves are transverse?

1. Light waves can travel in a vacuum.

2. Light waves show interference.

3. Light waves can be polarized.

4. Light waves can be diffracted.

Subtopic:  Polarization of Light |
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Interference was observed in interference chamber when the air was present, now the chamber is evacuated and if the same light is used, a careful observer will see

(1) No interference

(2) Interference with bright bands

(3) Interference with dark bands

(4) Interference in which width of the fringe will be slightly increased

Subtopic:  Superposition Principle |
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Two coherent sources have intensity in the ratio of $\frac{100}{1}$. Ratio of (intensity)max/(intensity)min is:
1. $\frac{1}{100}$
2. $\frac{1}{10}$
3.$\frac{10}{1}$
4. $\frac{3}{2}$

Subtopic:  Superposition Principle |
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If two waves represented by ${y}_{1}=4\mathrm{sin}\omega t$ and ${y}_{2}=3\mathrm{sin}\left(\omega t+\frac{\pi }{3}\right)$ interfere at a point, the amplitude of the resulting wave will be about

(1) 7

(2) 6

(3) 5

(4) 3.5

Subtopic:  Superposition Principle |
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Two coherent sources of intensities, I1 and I2 produce an interference pattern. The maximum intensity in the interference pattern will be

(1) I1 + I2

(2) ${I}_{1}^{2}+{I}_{2}^{2}$

(3) (I1 + I2)2

(4) ${\left(\sqrt{{I}_{1}}+\sqrt{{I}_{2}}\right)}^{2}$

Subtopic:  Superposition Principle |
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Two beams of light having intensities I and 4I interfere to produce a fringe pattern on a screen. The phase difference between the beams is $\frac{\pi }{2}$ at point A and π at point B. Then the difference between the resultant intensities at A and B is

(1) 2I

(2) 4I

(3) 5I

(4) 7I

Subtopic:  Superposition Principle |
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If an interference pattern has maximum and minimum intensities in a 36 : 1 ratio, then what will be the ratio of their amplitudes?

1. 5 : 7

2. 7 : 4

3. 4 : 7

4. 7 : 5

Subtopic:  Superposition Principle |
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