ndeviated through a uniform electric field  for intensity 5 x
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    Subject
    Physics

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    ICSE Class 12

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    ISC Class 12 Physics Solved Question Paper 2012

    Multiple Choice QuestionsShort Answer Type

    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.
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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:


    straight n space or space straight mu space equals space fraction numerator sin space open parentheses begin display style fraction numerator straight A space plus straight delta subscript straight m over denominator 2 end fraction end style close parentheses over denominator sin space open parentheses begin display style straight A over 2 end style close parentheses end fraction 
    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 straight E with rightwards harpoon with barb upwards on top for intensity 5 x 104 Vm-1 and a uniform magnetic field straight B with rightwards harpoon with barb upwards on top.

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

    (ii) What is the direction of straight B with rightwards harpoon with barb upwards on top space comma space if space space straight v with rightwards harpoon with barb upwards on top is towards right and straight E with rightwards harpoon with barb upwards on top is vertically downwards in the plane of this paper?

    open vertical bar straight v with rightwards harpoon with barb upwards on top close vertical bar space equals space 2 space x space 10 to the power of 6 space m divided by s open vertical bar E close vertical bar space equals space 5 space x space 10 to the power of 4 space V space m to the power of negative 1 end exponent space minus space 1 space a n d space open vertical bar B with rightwards harpoon with barb upwards on top close vertical bar space equals space ? space straight i right parenthesis thin space Condition space under space which space the space lectron space pass space undeviated. straight tau space open vertical bar straight E with rightwards harpoon with barb upwards on top close vertical bar space equals space straight tau space open vertical bar straight v with rightwards harpoon with barb upwards on top close vertical bar open vertical bar straight B with rightwards harpoon with barb upwards on top close vertical bar space equals space 5 space straight x space 10 to the power of 4 space equals space 2 space straight x space 10 to the power of 6 space open vertical bar straight B with rightwards harpoon with barb upwards on top close vertical bar open vertical bar straight B with rightwards harpoon with barb upwards on top close vertical bar space equals space fraction numerator 5 over denominator 2 space straight x space 10 squared end fraction space equals space 2.5 space straight x space 10 to the power of negative 2 end exponent space wb divided by straight m squared

    ii) Direction of straight B with rightwards harpoon with barb upwards on top is perpendicular to bold v with bold rightwards harpoon with barb upwards on top bold space a n d bold space bold E with bold rightwards harpoon with barb upwards on top using along the plane of the 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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