A parallel beam of moving electrons is incident normal on a narrow slit. A fluorescent screen is placed at a large distance from the slit. If the slit is further narrowed, then which of the following statement is correct

1.  The diffraction pattern is not observed on the screen in case of electrons

2.  The angular width of the central maximum of the diffraction pattern will increase

3.  The angular width of central maximum will decrease

4.  angular with of central maximum will remain same

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A diffraction pattern is observed using a beam of red light. What will happen if the red light is replaced by blue light?

1.  No change takes place

2.  Diffraction bands become narrower

3.  Diffraction bands become broader

4.  Diffraction pattern disappears

 

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Phenomen of polarisation justify the nature of light

1.  longitudinal 

2.  transverse

3.  both

4.  geometrical

 

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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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Interference fringes produced using white light in a double-slit arrangement. When a mica sheet of uniform thickness of the refractive index 1.6 (relative to air) is placed in the path of light from one of the slits, the central fringe moves by a distance. This distance is equal to the width of 30 interference bands if the light of wavelength 4800 Ao is used The thickness (in μm) of mica is —

1.  90

2.  12

3.  14

4.  24

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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 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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Two polarids 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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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

(a) nn+1             (b) 2nn+1

(c) nn+12         (d) 2nn+12

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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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