Two waves of intensity ratio 9:1 interfere to produce fringes in a young's double-slit experiment, the ratio of  intensity at maxima  to the intensity at minima is

1.  4:1

2.  9:1

3.  81:1

4.  9:4

 

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Superposition principle
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Young's double-slit experiment is first performed in air and then in a medium other than air. It is found that 8th bright fringe in the medium lies where 5th dark fringe lies in the air. The refractive index of the medium is nearly 

(a)1.25 

(b) 1.59 

(c) 1.69

(d) 1.78 

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Young Double slit experiment
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Two polaroids P1 and P2 are placed with their axis perpendicular to each other. Unpolarised light Io is incident on P1. A third polaroid P3 is kept in between P1 and P2 such that its axis makes an angle 45° with that of P1. The intensity of transmitted light through P2

(a)Io2

(b) Io4

(c) Io8

(d) Io16

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Polarization of light
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The interference pattern is obtained with two coherent light sources of intensity ratio n. In the interference pattern, the ratio Imax-IminImax+Imin will be

1.nn+1             

2. 2nn+1

3. nn+12         

4.2nn+12

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Superposition principle
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A linear aperture whose width is 0.02 cm is placed immediately in front of a lens of focal length 60 cm. The aperture is illuminated normally by a parallel beam of wavelength 5×10-5 cm. The distance of the first dark band of the diffraction pattern from the centre of the screen is

(a) 0.10 cm             (b) 0.25 cm 

(c) 0.20 cm             (d) 0.15 cm

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

(a) l04               (b) 34l0

(c) l02              (d) l0

Concept Questions :-

Young Double slit experiment
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In a diffraction pattern due to a single slit of width a,the first minimum is observed at an angle 30 when light of wavelength 5000 A˙ is incident on the slit. The first secondary maximum is observed is an angle of 

(a) sin-123           (b) sin-112

(c) sin-134           (d) sin-114

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Diffraction
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For a parallel beam of monochromatic light of wavelength diffraction is produced by a single slit whose width 'a' is of the order of the wavelength of the light. If 'D' is the distance of the screen from the slit, the width of the central maxima will be

(a)2Dλ/a

(b)Dλ/a

(c)Da/λ

(d)2Da/λ

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Diffraction
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In a double-slit experiment, the two slits are 1 mm apart and the screen is placed 1 m away. A monochromatic light of wavelength 500 nm is used. What will be the width of each slit for obtaining ten maxima of double-slit within the central maxima of a single-slit pattern?

1. 0.2 mm

2. 0.1 mm

3. 0.5 mm

4. 0.02 mm

Concept Questions :-

Young Double slit experiment
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Two slits in Young's experiment have widths in the ratio 1:25. The ratio of intensity at the maxima and minima in the interference pattern Imax/Imin is 

1. 9/4

2. 121/49

3. 49/121

4. 4/9

Concept Questions :-

Young Double slit experiment
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