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Ray Optics Test...

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  • Question 1
    4 / -1

    A ray of light makes an angle of 10° with the horizontal above it and strikes a plane mirror which is inclined at an angle θ to the horizontal. The angle θ for which the reflected ray becomes vertical is

  • Question 2
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    A thin rod of 5cm length is kept along the axis of a concave mirror of 10cm focal length such that its image is real and magnified and one end touches the rod. Its magnification will be

  • Question 3
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    A telescope using light having wavelength 5000 Å and using lenses of focal 2.5 and 30 cm. If the diameter of the aperture of the objective is 10 cm, then the resolving limit and magnifying power of the telescope is respectively

  • Question 4
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    A lens when placed on a plane mirror then object needle and its image coincide at 15 cm. The focal length of the lens is

  • Question 5
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    When sunlight is scattered by minute particles of atmosphere, the intensity of light scattered away is proportional to

  • Question 6
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    A glass slab consists of thin uniform layers of progressively decreasing refractive indices RI (see figure) such that the RI of any layer is μ — m∆μ. Here, μ and ∆µ denote the RI of zeroth layer and the difference in RI between any two consecutive layers, respectively. The integer m = 0, 1, 2, 3,... denotes the numbers of the successive layers.
    A ray of light from the zeroth layer enters the first layer at an angle of incidence of 30°. After undergoing the mth refraction, the ray emerges parallel to the interface. If μ = 1.5 and ∆μ = 0.015, the value of m is

  • Question 7
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  • Question 8
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    A right angled prism of refractive index μ1 is placed in a rectangular block of refractive index μ2, which is surrounded by a medium of refractive index μ3 , as shown in the figure, A ray of light e enters the rectangular block at normal incidence. Depending upon the relationships between μ1 , μ2 and μ3 , it takes one of the four possible paths ef, eg, eh or ei.

  • Question 9
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    Two thin lenses, one of focal length + 60 cm and the other of focal length -20 cm are put in contact. The combined focal length is

  • Question 10
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    P1, P2 are powers of two lenses and ω1, ω2 are dispersive powers of their materials. The condition for the combination to be achromatic is

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