WB JEE 2020 | Wave Optics Question 10 | Physics

1

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

2

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%

3

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

4

WB JEE 2018

MCQ (Single Correct Answer)

+1

-0.25

If Young's double slit experiment is done with white light, which of the following statements will be true?

A

All the bright fringes will be coloured.

B

All the bright fringes will be white.

C

The central fringe will be white.

D

No stable interference pattern will be visible.