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Ray Optics Test - 96
Result
Ray Optics Test - 96

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  • Question 1/10
    4 / -1
    The distance between a point source of light and a screen which is 60 cm is increased to 180 cm. The intensity on the screen as compared with the original intensity will be
    Solutions

  • Question 2/10
    4 / -1
    A source of light emits a continuous stream of light energy which falls on a given area. Luminous intensity is defined as
  • Question 3/10
    4 / -1
    Venus looks brighter than other stars because
    Solutions

  • Question 4/10
    4 / -1
    To prepare a print the time taken is 5 sec due to lamp of 60 watt at 0.25 m distance. If the distance is increased to 40 cm then what is the time taken to prepare the similar print
    Solutions

  • Question 5/10
    4 / -1
    A lamp is hanging lm above the centre of a circular table of diameter lm. The ratio of illuminaces at the centre and the edge is
    Solutions

  • Question 6/10
    4 / -1
    A lamp is hanging at a height of 4m above a table. The lamp is lowered by lm. The percentage increase in illuminace will be
    Solutions

  • Question 7/10
    4 / -1
    The intensity of direct sunlight on a surface normal to the rays is I0. What is the intensity of direct sunlight on a surface, whose normal makes an angle of 60° with the rays of the sun
    Solutions

  • Question 8/10
    4 / -1
    Inverse square law for illuminance is valid for
  • Question 9/10
    4 / -1
    1% of light of a source with luminous intensity 50 candela is incident on a circular surface of radius 10 cm. The average illuminance of surface is
    Solutions

  • Question 10/10
    4 / -1
    Two light sources with equal luminous intensity are lying at a distance of 1.2 m from each other. Where should a screen be placed between them such that illuminance on one of its faces is four times that on another face
    Solutions

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