Young's Double Slit Experiment

Practice Questions:

Question 1: easy

In a standard Young’s double slit setup, we get 60 fringes on a section of screen with
monochromatic light of wavelength 4000 Å. If we use monochromatic light of wavelength 6000Å, then the number of fringes that would be obtained in the same section is

1. 60

2. 90

3. 40

4. 1.5

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Question 2: easy

Two coherent sources of light can be obtained by :

1. Two different lamps

2. Two different lamps but of the same power

3. Two different lamps of same power and having the same colour

4. None of the above

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Question 3: easy

Two identical light waves, propagating in the same direction, have a phase difference δ. After they superpose, the intensity of the resulting wave will be proportional to :

1. cos δ

2. cos (δ/2)

3. cos² (δ/2)

4. cos² δ

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Question 4: easy

If the amplitude ratio of two sources producing interference is 3 : 5, the ratio of intensities at maxima and minima is :

1. 25 : 16

2. 5 : 3

3. 16 : 1

4. 25 : 9

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