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Weekly Quiz Competition
  • Question 1
    1 / -0

    We always get real image in a convex lens if the object is situated beyond

    Solution

    We always get real image in a convex lens if the object is situated beyond focus.

     

  • Question 2
    1 / -0

    A ray of light strikes a thick parallel sided glass slab with an angle of incidence of 400. The angle of the beam emerging from the other side of the slab with the normal is

    Solution

    In the glass slab, angle of incidence = angle of emergence

    A ray of light strikes a thick parallel sided glass slab with an angle of incidence of 400. The angle of the beam emerging from the other side of the slab with the normal is 400.

     

  • Question 3
    1 / -0

    If f0 and fe are the focal lengths of the objective and eye – piece, respectively for a telescope, the magnifying power of the telescope will be

    Solution

    If f0 and fe are the focal lengths of the objective and eye – piece, respectively for a telescope, the magnifying power of the telescope will be fo/fe

     

  • Question 4
    1 / -0

    Dispersion produced by a prism depends upon

    Solution

    Dispersion produced by a prism depends uponits refracting angle.

     

  • Question 5
    1 / -0

    Coloured band of light obtained by dispersion of white light is called

    Solution

    Coloured band of light obtained by dispersion of white light is called spectrum.

     

  • Question 6
    1 / -0

    The sky appears blue because the earth's atmosphere

    Solution

    The sky appears blue because the earth's atmosphere scatters blue light the most.

     

  • Question 7
    1 / -0

    In a room, artificial rain is produced at one end and a strong source of white light is switched on at the other end. To observe the rainbow, an observer must

    Solution

    In atmosphere, rainbow is observed when the observer looks towards the water droplets in the air after the rain with his back towards the sun. To observe the rainbow in the mentioned room, the observer must look towards the raindrops with his/her back towards the source of the white light.

     

  • Question 8
    1 / -0

    An eye specialist prescribes spectacles having a combination of convex lens of focal length 50 cm in contact with a concave lens of focal length 25 cm. The power of this combination of lenses (in dioptre) is

    Solution

    Power for convex lens = 100/50 = 2 D
    Power for concave lens = -100/25 = -4 D
    Total power = -4 D + 2 D = -2 D

     

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