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Ray Optics Test - 27
Result
Ray Optics Test - 27

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  • Question 1/10
    4 / -1
    Dispersive power depends on the following
  • Question 2/10
    4 / -1
    Two thin lenses of focal lengths f1 and f2 are placed in contact with each other. The focal length of the combination is
  • Question 3/10
    4 / -1
    A convex lens is in contact with concave lens. The magnitude of the ratio of their focal length is 2/3. Their equivalent focal length is 30 cm. What are their individual focal lengths?
  • Question 4/10
    4 / -1
    A thin glass (refractive index 1.5) lens has optical power of - 5 D in air. Its optical power in a liquid medium with refractive index 1.6 will be
    Solutions

  • Question 5/10
    4 / -1
    Refractive index of glass with respect to medium is 4/3. If the differences between velocities of light in medium and glass is 6.25 × 107 ms-1, then velocity of light in medium is
    Solutions

  • Question 6/10
    4 / -1
    The focal length of an equi-convex lens is greater than the radius of curvature of any of the surfaces. Then, the refractive index of the material of the lens is
  • Question 7/10
    4 / -1
    An electric bulb of luminous intensity I is suspended at a height h from centre of the table having a circular surface diameter 2 r. The illuminance at centre of circular dis will be
    Solutions

  • Question 8/10
    4 / -1
    At what distance should a book be placed from a 50 Cd bulb so that the illuminance on the book becomes 2 lmm–2 ?
    Solutions

  • Question 9/10
    4 / -1
    A point source of 100 candela is held 5m above a sheet of blotting paper which reflects 75% of light incident upon it. The illuminance of blotting paper is
    Solutions

  • Question 10/10
    4 / -1
    Luminous flux and luminous intensity are related as
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