Wave Optics Test

Result

Wave Optics Test - 52

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Weekly Quiz Competition

Question 1
4 / -1

In a two slit experiment with monochromatic light fringes are obtained on a screen placed at some distance from the sits. If the screen is moved by 5 × 10^–2 m towards the slits, the change in fringe width is 3 × 10^–5 m. If separation between the slits is 10^–3 m, the wavelength of light used is

A
6000 Å

B
5000 Å

C
3000 Å

D
4500 Å

Solution
Question 2
4 / -1

In the figure is shown Young\'s double slit experiment. Q is the position of the first bright fringe on the right side of O. P is the 11th fringe on the other side, as measured from Q. If the wavelength of the light used is 600 × 10^–10 m, then S₁B will be equal to

A
6 × 10^–6m

B
6.6 × 10^–6m

C
3.138 × 10^–7m

D
3.144 × 10^–7m

Solution
Question 3
4 / -1

Four light waves are represented by
(i) y = a₁ sin ω t
(ii) y = a₂ sin (ω t + ϕ)
(iii)y = a₁ sin 2ω t
(iv) y = a₂ sin2 (ω t + ϕ)
Interference fringes may be observed due to superposition of

A
(i) and (ii)

B
(i) and (iii)

C
(ii) and (iv)

D
(iii) and (iv)
Question 4
4 / -1

In Young\'s double slit experiment the y-co-ordinates of central maxima and 10th maxima are 2 cm and 5 cm respectively. When the YDSE apparatus is immersed in a liquid of refractive index 1.5 the corresponding y-co-ordinates will be

A
2 cm, 7.5 cm

B
3 cm, 6 cm

C
2 cm, 4 cm

D
4/3 cm, 10/3 cm

Solution
Question 5
4 / -1

The maximum intensity in Young\'s double slit experiment is I₀. Distance between the slits is d = 5λ, where λ is the wavelength of monochromatic light used in the experiment. What will be the intensity of light in front of one of the slit on a screen at a distance D =10 d

A

B

C

D

Solution
Question 6
4 / -1

A monochromatic beam of light falls on YDSE apparatus at some angle (say θ) as shown in figure. A thin sheet of glass in inserted in front of the lower slit S₂. The central bright fringe (path difference = 0) will be obtained

A
At O

B
Above O

C
Below O

D
Anywhere depending on angle θ, thickness of plate t and refractive of glass µ

Solution
Question 7
4 / -1

In Young\'s double slit experiment how many maximas can be obtained on a screen (including the central maximum) on both sides of the central fringe if λ = 2000 Å and d= 7000 Å

A
12

B
7

C
18

D
4

Solution
Question 8
4 / -1

In a Young\'s double slit experiment, the slits are 2 mm apart and are illuminated with a mixture of two wavelengths λ₀ = 750 nm and λ = 900 nm. The minimum distance from the common central bright fringe on a screen 2 m from the slits where a bright fringe from one interference pattern coincides with a bright fringe from the other is

A
1.5 mm

B
3 mm

C
4.5 mm

D
6 mm

Solution
Question 9
4 / -1

A flake of glass (refractive index 1.5) is placed over one of the openings of a double slit apparatus. The interference pattern displaces itself through seven successive maxima towards the side where the flake is placed. If wavelength of the diffracted light is λ = 600 nm, then the thickness of the flake is

A
2100 nm

B
4200 nm

C
8400 nm

D
None of these

Solution
Question 10
4 / -1

Two ideal slits S₁ and S₂ are at a distance d apart, and illuminated by light of wavelength λ passing through an ideal source slit S placed on the line through S₂ as shown. The distance between the planes of slits and the source slit is D. A screen is held at a distance D from the plane of the slits. The minimum value of d for which darkness at O is

A

B

C

D

Solution