Wave Optics Test

Result

Wave Optics Test - 30

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Weekly Quiz Competition

Question 1
4 / -1

In Young\'s double slit interference experiment, the slit separation is made 3 fold. The fringe width becomes

A
1/3 times

B
1/9 times

C
3 times

D
9 times

Solution
Question 2
4 / -1

In a certain double slit experimental arrangement interference fringes of width 1.0 mm each are observed when light of wavelength 5000 Å is used. Keeping the set up unaltered, if the source is replaced by another source of wavelength 6000 Å, the fringe width will be

A
0.5 mm

B
1.0 mm

C
1.2 mm

D
1.5 mm

Solution
Question 3
4 / -1

The figures shows a double slit experiment where P and Q are the slits. The path length PX and QX are nλ and (n + 2) λ respectively, where n is a whole number and A is the wavelength. Taking the central fringe as zero, what is formed at X?

A
First bright

B
First dark

C
Second bright

D
Second dark

Solution
Question 4
4 / -1

In Young\'s double slit experiment, if one of the slits is closed fully, then in the interference pattern

A
A bright slit will be observed, no interference pattern will exist

B
The bright fringes will becomes more bright

C
The bright fringes will become fainter

D
None of the above
Question 5
4 / -1

In Young\'s double slit experiment, a glass plate is placed before a slit which absorbs half the intensity of light. Under this case

A
The brightness of fringes decreases

B
The fringe width decreases

C
No fringes will be observed

D
The bright fringes becomes fainter and the dark fringes have finite light intensity
Question 6
4 / -1

The maximum intensity of fringes in Young\'s experiment is I. If one of the slit is closed, then the intensity at that place becomes I₀. Which of the following relation is true?

A
I = I₀

B
I = 2 I₀

C
I = 4 I₀

D
There is no relation between I and I₀

Solution
Question 7
4 / -1

In a Young\'s double slit experiment (slit distance d monochromatic light of wavelength λ is used and the figure pattern observed at a distance L from the slits. The angular position of the bright fringes are

A

B

C

D

Solution
Question 8
4 / -1

The Young\'s experiment is performed with the lights of blue (λ = 4360 Å) and green colour (λ = 5460Å ), If the distance of 4th fringe the centre is x, then

A

B

C

D

Solution
Question 9
4 / -1

In the Young\'s double slit experiment, the spacing between two slits is 0.1 mm. If the screen is kept at a distance 1.0 m from the slits and the wavelength of light is 5000 Å, then the fringe width is

A
1.0 cm

B
1.5 cm

C
0.5 cm

D
2.0 cm

Solution
Question 10
4 / -1

In Young\'s double slit experiment, if L is the distance between the slits and the screen upon which interference pattern is observed, x is the average distance between the adjacent fringes and d being the slit separation. The wavelength of light is given by

A

B

C

D

Solution