Wave Optics Test

Result

Wave Optics Test - 39

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Weekly Quiz Competition

Question 1
4 / -1

How fast a person should drive his car so that the red signal of light appears green?
(Wavelength for red colour = 6200 Å and wavelength for green colour = 5400 Å)

A
1.5 × 10⁸ m/s

B
7 × 10⁷ m/s

C
3.9 × 10⁷ m/s

D
2 × 10⁸ m/s

Solution
Question 2
4 / -1

Two beams of light will not give rise to an interference pattern, if

A
They are coherent

B
They have the same wavelength

C
They are linearly polarized perpendicular to each other

D
They are not monochromatic
Question 3
4 / -1

A parallel beam of fast moving electrons is incident normally on a narrow slit. A screen is placed at a large distance from the slit. It the speed of the electrons is increased, which of the following statement is correct

A
Diffraction pattern is not observed on the screen in the case of electrons

B
The angular width of the central maxima of the diffraction pattern will increase

C
The angular width of the central maxima will decrease

D
The angular width of the central maxima will remain the same

Solution
Question 4
4 / -1

Consider Fraunhoffer diffraction pattern obtained with a single slit at normal incidence. At the angular position of first diffraction minimum, the phase difference between the wavelets from the opposite edges of the slit is

A
π / 4

B
π / 2

C
π

D
2 π

Solution
Question 5
4 / -1

Angular width (β) of central maximum of a diffraction pattern on a single slit does not depend upon

A
Distance between slit and source

B
Wavelength of light used

C
Width of the slit

D
Frequency of light used

Solution
Question 6
4 / -1

In the experiment of diffraction at a single slit, if the slit width is decreased, the width of the central maximum

A
Increases in both Fresnel and Fraunhoffer diffraction

B
Decreases both in Fresnal and Fraunhoffer diffraction

C
Increases in Fresnel diffraction but decreases in Fraunhoffer diffraction

D
Decreases in Fresnel diffraction but increases is Fraunhoffer diffraction
Question 7
4 / -1

Conditions of diffraction is

A

B

C

D
None of these

Solution
Question 8
4 / -1

The phenomenon of diffraction of light was discovered by

A
Huyghen

B
Newton

C
Fresnel

D
Grimaldi
Question 9
4 / -1

In a diffraction pattern by a wire, on increasing diameter of wire, fringe width

A
Decreases

B
Increases

C
Remains unchanged

D
Increasing or decreasing will depend on wavelength

Solution
Question 10
4 / -1

What will be the angular width of central maxima in Fraunhoffer diffraction when light of wavelength 6000 Å is used and slit width is 12 × 10^–5 cm?

A
2 rad

B
3 rad

C
1 rad

D
8 rad

Solution