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

12th Standard

    Reg.No. :
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Physics

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

    Part I

    5 x 1 = 5
  1. The speed of light in an isotropic medium depends on, ______.

    (a)

    its intensity

    (b)

    its wavelength

    (c)

    the nature of propagation

    (d)

    the motion of the source w.r.t medium

  2. An object is placed in front of a convex mirror of focal length off and the maximum and minimum distance of an object from the mirror such that the image formed is real and magnified.

    (a)

    2f and c

    (b)

    c and \(\infty\)

    (c)

    f and O

    (d)

    None of these

  3. If the velocity and wavelength of light in air is Va and λa and that in water is Vw and λw, then the refractive index of water is______.

    (a)

    \(\frac{V_W}{V_a}\)

    (b)

    \(\frac{V_a}{V_W}\)

    (c)

    \(\frac{\lambda_W}{\lambda_a}\)

    (d)

    \(\frac{{V_a}\lambda_a}{{V_W}\lambda_W}\)

  4. When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid, it acts as plane sheet of glass. This implies that the liquid must have refractive index, ______.

    (a)

    less than one

    (b)

    less than that of glass

    (c)

    greater than that of glass

    (d)

    equal to that of glass

  5. An air bubble in glass slab of refractive index 1.5 (near normal incidence) is 5 cm deep when viewed from one surface and 3 cm deep when viewed from the opposite face. The thickness of the slab is ______.

    (a)

    8 cm

    (b)

    10 cm

    (c)

    12 cm

    (d)

    16 cm

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