If L is the coherence length and c the velocity of light, the coherent time is 

(1) cL

(2) Lc

(3) cL

(4) 1Lc

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) (2n1)λ4

(2) (2n1)λ2

(3) nλ

(d) (2n+1)λ2

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 1001. Ratio of (intensity)max/(intensity)min is: 
1. 1100
2. 110
3.101
4. 32

Subtopic:  Superposition Principle |
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If two waves represented by y1=4sinωt and y2=3sinωt+π3 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) I12+I22

(3) (I1 + I2)2

(4) (I1+I2)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 π2 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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