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Ray Optics Test - 101

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Ray Optics Test - 101
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Weekly Quiz Competition
  • Question 1
    4 / -1
    A light source is located at P1 as shown in the figure. All sides of the polygon are equal. The intensity of illumination at P2 is I0. What will be the intensity of illumination at P3

    Solution

  • Question 2
    4 / -1
    A container is filled with water (μ = 1.33) upto a height of 33.25 cm. A concave mirror is placed 15 cm above the water level and the image of an object placed at the bottom is formed 25 cm below the water level. Thefocal length of the mirror is

    Solution

  • Question 3
    4 / -1
    A point object is moving on the principal axis of a concave mirror of focal length 24cm towards the mirror. When it is at a distance of 60cm from the mirror, its velocity is 9cm / sec. What is the velocity of the image at that instant
    Solution

  • Question 4
    4 / -1
    A concave mirror is placed on a horizontal table with its axis directed vertically upwards. Let Obe 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 5
    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 6
    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 7
    4 / -1
    A convex lens of focal length 30 cm and a concave lens of 10 cm focal length are placed so as to have the same axis. If a parallel beam of light falling on convex lens leaves concave lens as a parallel beam, then the distance between two lenses will be
    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
    Solution

  • 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 focused to photograph an object placed at A

    Solution

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