In a double silt experiment, two identical point sources S 1 and S 2 are placed on a line perpendicular to the two slits P and Q as shown (the figure is not to scale). The screen is placed away compared to the distance between the slits. When only S 1 is switched on, there is an interference pattern with a peak intensity I 1 . When only S 2 is switched on, there is an interference pattern with peak intensity I 2 I 2 < I 1 . When both S 1 and S 2 are switched on,

there will be uniform intensity on the screen.

the intensity on the screen will vary from I 1 < I 2 to I 1 + I 2 .

the intensity on the screen will vary from 0 to I 1 + I 2 2 .

the intensity on the screen will vary from 0 to I 1 + I 2 .

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Important Questions on Wave Optics

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 10 - Wave Optics>Exercise#2>Q 1

Two polaroids are placed

90 °

to each other and the transmitted intensity is zero. One more polaroid is placed between them bisecting the angle between them. Let

I

be the intensity of light just after the first polaroid. The fraction of I transmitted by the system is-

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 10 - Wave Optics>Exercise#2>Q 2

Unpolarized light is incident at a plane interface from medium

1

to medium

2

with refractive indices,

μ_{1}

and

μ_{2}

, respectively. The angle of incidence

I

for which the reflected ray is totally plane polarised is,

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 10 - Wave Optics>Exercise#2>Q 3

In a double silt experiment, two identical point sources $S_{1}$ and $S_{2}$ are placed on a line perpendicular to the two slits $P$ and $Q$ as shown (the figure is not to scale). The screen is placed away compared to the distance between the slits.

Question Image

When only $S_{1}$ is switched on, there is an interference pattern with a peak intensity $I_{1}$ . When only $S_{2}$ is switched on, there is an interference pattern with peak intensity $I_{2} (I_{2} < I_{1})$ . When both $S_{1}$ and $S_{2}$ are switched on,

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 10 - Wave Optics>Exercise#2>Q 4

A parallel monochromatic beam of yellow light

(λ = 6 \times 10^{- 7} m)

next to the central bright maximum, the angle of the first minimum in the diffraction pattern (with respect to the initial direction of the beam) is approximately, (take slit width

b = 2.05 \times 10^{- 6} m

)

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 10 - Wave Optics>Exercise#2>Q 5

Monochromatic light falls on a pair of slits mounted

24 cm

in front of a photographic film. After exposure, the film shows a series of bright bands spaced

0.20 cm

apart. The separation between the slits is

6.0 \times 10^{- 3} cm

. The wavelength of light is,

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 10 - Wave Optics>Exercise#2>Q 6

In Young's double slit experiment, the distance between the two slits is

0.1 mm

, the distance between the slits and the screen is

1 m

and the wavelength of the light used is

600 nm

. The intensity at a point on the screen is

75 %

of the maximum intensity. What is the smallest distance of this point from the central fringe?

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 10 - Wave Optics>Exercise#2>Q 7

A plane polarised light is passed through successive polarisers which are rotated by

30 °

with respect to each other in the clockwise direction. Neglecting absorption by the polarisers and given that the first polariser's axis is parallel to the plane of polarisation of the incident light, the intensity of light at the exit of the fifth polariser is closest to,

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Practice Book for KVPY Aptitude Test - Stream SX Physics>Chapter 10 - Wave Optics>Exercise#2>Q 8

In Young's double slit set-up, light from a laser source falls on a pair of very narrow slits separated by

1.0 μm

and bright fringes separated by

1.0 mm

are observed on a distant screen. If the frequency of the laser light is doubled, what will be the separation of the bright fringes?

The meaning of wavefront is:-

Important Questions on Wave Optics

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