WB JEE 2020 | Wave Optics Question 9 | Physics

1

WB JEE 2020

MCQ (Single Correct Answer)

+1

-0.25

The intensity of light emerging from one of the slits in a Young's double slit experiment is found to be 1.5 times the intensity of light emerging from the other slit. What will be the approximate ratio of intensity of an interference maximum to that of an interference minimum?

A

2.25

B

98

C

5

D

9.9

2

WB JEE 2020

MCQ (Single Correct Answer)

+1

-0.25

In a Fraunhofer diffraction experiment, a single slit of width 0.5 mm is illuminated by a monochromatic light of wavelength 600 nm. The diffraction pattern is observed on a screen at a distance of 50 cm from the slit. What will be the linear separation of the first order minima?

A

1.0 mm

B

1.1 mm

C

0.6 mm

D

1.2 mm

3

WB JEE 2019

MCQ (Single Correct Answer)

+1

-0.25

In Young's experiment for the interference of light, the separation between the slits is d and the distance of the screen from the slits is D. If D is increased by 0.5% and d is decreased by 0.3% then for the light of a given wavelength , which one of the following is true? "The fringe width ..............

A

increases by 0.8%

B

decreases by 0.8%

C

increases by 0.2%

D

decreases by 0.2%

4

WB JEE 2019

MCQ (Single Correct Answer)

+1

-0.25

When the frequency of the light used is changed from $$4 \times {10^{14}}{s^{ - 1}}$$ to $$5 \times {10^{14}}{s^{ - 1}}$$, the angular width of the principal (central) maximum in a single slit Fraunhoffer diffraction pattern changes by 0.6 radian. What is the width of the slit (assume that the experiment is performed in vacuum)?

A

$$1.5 \times {10^{ - 7}}$$ m

B

$$3 \times {10^{ - 7}}$$ m

C

$$5 \times {10^{ - 7}}$$ m

D

$$6 \times {10^{ - 7}}$$ m