10th Standard English Medium Science Subject Optics Book Back 1 Mark Questions with Solution Part - II

10th Standard

    Reg.No. :
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Science

Time : 00:30:00 Hrs
Total Marks : 5
    5 x 1 = 5
  1. Where should an object be placed so that a real and inverted image of same size is obtained by a convex lens

    (a)

    f

    (b)

    2f

    (c)

    infinity

    (d)

    between f and 2f

  2. Magnification of a convex lens is

    (a)

    Positive

    (b)

    negative

    (c)

    either positive or negative

    (d)

    zero

  3. Power of a lens is –4D, then its focal length is

    (a)

    4m

    (b)

    –40m

    (c)

    –0.25 m

    (d)

    –2.5 m

  4. The eye defect ‘presbyopia’ can be corrected by

    (a)

    convex lens

    (b)

    concave lens

    (c)

    convex mirror

    (d)

    Bi focal lenses

  5. If VB, VG, VR be the velocity of blue, green and red light respectively in a glass prism, then which of the following statement gives the correct relation?

    (a)

    VB = VG = VR

    (b)

    VB > VG >VR

    (c)

    VB < VG < VR

    (d)

    VB < VG > VR

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