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12th Standard English Medium Physics Subject Ray Optics Book Back 1 Mark Questions with Solution Part - II

12th Standard

    Reg.No. :
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Physics

Time : 00:30:00 Hrs
Total Marks : 5

    Part I

    5 x 1 = 5
  1. A rod of length 10 cm lies along the principal axis of a concave mirror of focal length 10 cm in such a way that its end closer to the pole is 20 cm away from the mirror. The length of the image is, ______.

    (a)

    2.5 cm

    (b)

    5cm

    (c)

    10 cm

    (d)

    15cm

  2. For light incident from air on a slab of refractive index 2, the maximum possible angle of refraction is, ______.

    (a)

    30o

    (b)

    45o

    (c)

    60o

    (d)

    90o

  3. Stars twinkle due to, ______.

    (a)

    reflection

    (b)

    total internal reflection

    (c)

    refraction

    (d)

    polarisation

  4. The radius of curvature of curved surface at a thin planoconvex lens is 10 cm and the refractive index is 1.5. If the plane surface is silvered, then the focal length will be, ______.

    (a)

    5 cm

    (b)

    10 cm

    (c)

    15 cm

    (d)

    20 cm

  5. A ray of light travelling in a transparent medium of refractive index n falls, on a surface separating the medium from air at an angle of incidents of 45o . The ray can undergo total internal reflection for the following n, ______.

    (a)

    n = 1.25

    (b)

    n = 1.33

    (c)

    n = 1.4

    (d)

    n = 1.5

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