Wave Optics Test

Result

Wave Optics Test - 31

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Weekly Quiz Competition

Question 1
4 / -1

In a Young\'s double slit experiment, the central point on the screen is

A
Bright

B
Dark

C
First bright and then dark

D
First dark and then bright
Question 2
4 / -1

In a Young\'s double slit experiment, the fringe width is found to be 0.4 mm. If the whole apparatus is immersed in water of refractive index 4/3 without disturbing the geometrical arrangement, the new fringe width will be

A
0.30 mm

B
0.40 mm

C
0.53 mm

D
450 micron

Solution
Question 3
4 / -1

In double slit experiment, for light of which colour the fringe width will be minimum?

A
Violet

B
Red

C
Green

D
Yellow

Solution
Question 4
4 / -1

In Young\'s double slit interference pattern the fringe width

A
Can be changed only by changing the wavelength of incident light

B
Can be changed only by changing the separation between the two slits

C
Can be changed either by changing the wavelength or by changing the separation between the two slits

D
Is a universal constant, hence cannot be changed

Solution
Question 5
4 / -1

In Young\'s double slit experiment, the phase difference between the light waves reaching third bright fringe from the central fringe will be (λ = 6000Å)

A
Zero

B
2π

C
4 π

D
6 π

Solution
Question 6
4 / -1

In Young\'s double slit experiment, if the widths of the slits are in the ratio 4 : 9, the ratio of the intensity at maxima to the intensity at minima will be

A
169 : 25

B
81 : 16

C
25 : 1

D
9 : 4

Solution
Question 7
4 / -1

In Young\'s double slit experiment when wavelength used is 6000 Å and the screen is 40 cm from the slits, the fringes are 0.012 cm wide. What is the distance between the slits

A
0.024 cm

B
2.4 cm

C
0.24 cm

D
0.2 cm

Solution
Question 8
4 / -1

In two separate set-ups of the Young\'s double slit experiment, fringes of equal width are observed when lights of wavelength in the ratio 1 : 2 are used. If the ratio of the slit separation in the two cases is 2 : 1, the ratio of the distances between the plane of the slits and the screen in the two set-ups is

A
4 : 1

B
1 : 1

C
1 : 4

D
2 : 1

Solution
Question 9
4 / -1

In an interference experiment, the spacing between successive maxima or minima is
(Where the symbols have usual meanings)

A

B

C

D
Question 10
4 / -1

In Young\'s double slit experiment, a third slit is made in between the double slits. Then

A
Fringes of unequal width are formed

B
Contrast between bright and dark fringes is reduced

C
Intensity of fringes totally disappears

D
Only bright light is observed on the screen