11.Which electromagnetic radiation has wavelength greater than that of X rays and smaller than that of visible light?
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12.How did Fresnel construct a biprism in order to study interference of light?
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13.State Brewster’s law of polarisation of light.
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14.A thin convex lens (L1) of focal length 80 cm and a thin concave lens (L2) of focal length f are kept co-axially, 20 cm apart as shown in figure 3 below. When a narrow and parallel beam of light is incident on the convex lens, bean emerging fron the concave lens is also a parallel beam. Find f.
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15.What condition must be satisfied by two thin lenses kept in contact so that they form an achromatic doublet, i.e. a combination free from chromatic aberration ?
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16.Threshold frequency of a certain metal for photo-electric emission is 5x1014Hz. Calculate its work function.
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17.What conclusion was drawn by Rutherford based on Geiger-Marsden’s experiment on scattering of alpha particles?
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