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Ray Optics Test - 111
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Ray Optics Test - 111

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  • Question 1/10
    4 / -1
    Assertion Within a glass slab, a double convex air bubble is formed. This air bubble behaves like a converging lens.
    Reason Refractive index of air is more than the refractive index of glass.
    Solutions

  • Question 2/10
    4 / -1
    Assertion The images formed by total internal reflections are much brighter than those formed by mirrors or lenses.
    ReasonThere is no loss of intensity in total internal reflection.
  • Question 3/10
    4 / -1
    Assertion The focal length of lens does not change when red light is replaced by blue light.
    Reason The focal length of lens does not depends on colour of light used.
    Solutions

  • Question 4/10
    4 / -1
    Assertion There is no dispersion of light refracted through a rectangular glass slab.
    Reason Dispersion of light is the phenomenon of splitting of a beam of white light into its constituent colours.
  • Question 5/10
    4 / -1
    Assertion All the materials always have the same colour, whether viewed by reflected light or through transmitted light.
    ReasonThe colour of material does not depend on nature of light
  • Question 6/10
    4 / -1
    Assertion By roughening the surface of a glass sheet its transparency can be reduced.
    ReasonGlass sheet with rough surface absorbs more light.
    Solutions

  • Question 7/10
    4 / -1
    Assertion By increasing the diameter of the objective of telescope, we can increase its range.
    ReasonThe range of a telescope tells us how far away a star of some standard brightness can be spotted by telescope.
    Solutions

  • Question 8/10
    4 / -1
    Assertion For the sensitivity of a camera, its aperture should be reduced.
    Reason Smaller the aperture, image focusing is also sharp.
  • Question 9/10
    4 / -1
    Assertion If objective and eye lenses of a microscope are interchanged then it can work as telescope.
    Reason The objective of telescope has small focal length.
    Solutions

  • Question 10/10
    4 / -1
    Assertion The illuminance of an image produced by a convex lens is greater in the middle and less towards the edges.
    Reason The middle part of image is formed by undeflected rays while outer part by inclined rays.
    Solutions

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