﻿ In Young’s double slit experiment using monochromatic light of

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# 31.In Young’s double slit experiment using monochromatic light of wave-length 600 nm, interference pattern was obtained on a screen kept l-5m away from the plane of the two slits. Calculate the distance between the two slits, if fringe separation/fringe width was found to be 1-0 mm.

Given:

λ = 600nm = 600x 10-9m = 6 x 10-7 m

D = 1.5 m, d = ? and β = 1mm = 10-3m

Now, using the formula,

where d is the distance between the slits.

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32. Draw a labelled graph to show variation in intensity of diffracted light with angular position, in a single slit diffraction experiment.
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33. You are provided with a narrow and parallel beam of light. State how you will determine experimentally, whether it is a beam of ordinary (unpolarized) light, partially polarised light or completely polarised light.
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34. For any prism, show that refractive index of its material is given by:

where the terms have their usual meaning.
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35. Figure 6 below shows a parallel beam of monochromatic light incident on a convex spherical surface, radius of curvature R = 30 cm, which separates glass (refractive index = 1.6) from air. Find the position of the image formed due to refraction of light at this single spherical surface.

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36.

(i) What is meant by:

(A) Spherical aberration?

(B) Chromatic aberration?

(ii) How can spherical aberration be reduced/minimized? Suggest any one method.

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37. A compound microscope consists of an objective of focal length 2 cm and an eye piece of focal length 5 cm. When an object is kept 2.4 cm from the objective, final image formed is virtual and 25 cm from the eye piece. Determine magnifying power of this compound microscope in this set up i.e. in normal use.
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38.

(i) Define Resolving Power of a simple astronomical telescope.

(ii) State one advantage of a reflecting telescope over refracting telescope.

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39.

ndeviated through a uniform electric field  for intensity 5 x 104 Vm-1 and a uniform magnetic field .

(i) Find the magnitude of magnetic flux density B of the magnetic field.

(ii) What is the direction of  is towards right and  is vertically downwards in the plane of this paper?

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40. Monochromatic light of wavelength 198 nm is incident on the surface of a metal, whose work function is 2-5 eV. Calculate the stopping potential.
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