Fraunhoffer diffraction from a single slit of width 1.24 x 10-6�
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    Physics

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    ICSE Class 12

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    ISC Class 12 Physics Solved Question Paper 2005

    Multiple Choice QuestionsShort Answer Type

    11. Show that S.I. unit of illuminance lux is equal to lumen/meter2 .
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    12. Light is incident on a block of glass at the polarizing angle. How does this polarising angle vary with the wavelength of light ?
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    13. Fraunhoffer diffraction from a single slit of width 1.24 x 10-6 m is observed with light of wavelength 6200 Å. Calculate the angular width of the central maximum

    Slit width, d = 1.24 x 10-6 m

    Wavelength, λ = 6200 x 10-10 m

    Angular width of central maximum,

    straight Z space straight theta space equals space Zλ over straight d space equals space fraction numerator 2 space straight x space 6200 space straight x space 10 to the power of negative 10 end exponent over denominator 1.24 space straight x space 10 to the power of negative 6 end exponent end fraction space space space space space space space space equals space 10 to the power of 10 space straight x space 10 to the power of negative 10 end exponent Zθ space equals space 1

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    14. Refractive index of the material of a concave lens is p. The lens is immersed in a medium of refractive index μ1 (μ1 > μ) . A parallel beam of light is incident on the lens. Draw a diagram to show the path of emergent rays.
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    15. For an achromatic combination of lenses in contact, why should the lenses be of opposite nature ?
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    16. An electron and a proton possess the same kinetic energy. Which of the two has greater de-Broglie wavelength ? Write down the formula used.
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    17. How will you increase the penetrating power of X-rays produced in an X-ray tube ?
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    18. The half-life of radon is 3.8 days. Calculate the amount of radon left undecayed in a sample containing 1024 mg of radon after 38 days.
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    19. The energy of an electron in the first Bhor orbit of an atom is -27.2 eV. What will be the energy in the third orbit ?
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    20. Explain why the electrical conductivity of a pure semiconductor increases on heating.
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