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Ray Optics Test - 156

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Ray Optics Test - 156
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Weekly Quiz Competition
  • Question 1
    4 / -1
    A point object is moving on the principal axis of a concave mirror of focal length 24 cm towards the mirror. When it is at a distance of 60 cm from the mirror, its velocity is 9cm / sec. What is the velocity of the image at that instant?
    Solution

  • Question 2
    4 / -1
    A concave mirror is placed on a horizontal table with its axis directed vertically upwards. Let O be the pole of the mirror and C its centre of curvature. A point object is placed at C. It has a real image, also located at C. If the mirror is now filled with water, the image will be
    Solution

  • Question 3
    4 / -1
    The diameter of moon is 3.5 × 103 km and its distance from the earth is 3.8 × 105 km. If it is seen through atelescope whose focal length for objective and eye lens are 4 m and 10 cm respectively, then the angle subtended by the moon on the eye will be approximately
    Solution

  • Question 4
    4 / -1
    The focal length of an objective of a telescope is 3 metre and diameter 15 cm. Assuming for a normal eye, the diameter of the pupil is 3 mm for its complete use, the focal length of eye piece must be
    Solution

  • Question 5
    4 / -1
    We wish to see inside an atom. Assuming the atom to have a diameter of 100 pm, this means that one must be able to resolved a width of say 10 pm. If an electron microscope is used, the minimum electron energy required is about
    Solution

  • Question 6
    4 / -1
    A telescope has an objective lens of 10 cm diameter and is situated at a distance of one kilometre from two objects. The minimum distance between these two objects, which can be resolved by the telescope, when the mean wavelength of light is 5000 Å, is of the order of
    Solution

  • Question 7
    4 / -1
    Two point white dots are 1 mm apart on a black paper. They are viewed by eye of pupil diameter 3 mm. Approximately, what is the maximum distance at which dots can be resolved by the eye ? [Take wavelength of light = 500 nm]

    Solution

  • Question 8
    4 / -1
    A small plane mirror placed at the centre of a spherical screen of radius R. A beam of light is falling on the mirror. If the mirror makes n revolution per second, the speed of light on the screen after reflection from the mirror will be
  • Question 9
    4 / -1
    A room (cubical) is made of mirrors. An insect is moving along the diagonal on the floor such that the velocity of image of insect on two adjacent wall mirrors is 10 cms–1. The velocity of image of insect in ceiling mirror is
    Solution

  • Question 10
    4 / -1
    Figure shows a cubical room ABCD with the wall CD as a plane mirror. Each side of the room is 3m. We place a camera at the midpoint of the wall AB. At what distance should the camera be focussed to photograph an object placed at A

    Solution

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