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Ray Optics Test - 45

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Ray Optics Test - 45
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Weekly Quiz Competition
  • Question 1
    4 / -1
    The focal lengths of objective and the eye–piece of a compound microscope are fo and fe respectively.Then___________.
  • Question 2
    4 / -1
    The magnifying power of a telescope is 9.0 when it is focused for parallel rays, then the distance between its objective and eye–piece is 20 cm The focal lengths of lenses will be___________.
  • Question 3
    4 / -1
    A plano convex lens of f = 20 cm is silvered at plane surface new f will be___________cm
    Solution

  • Question 4
    4 / -1
    A ray of light from denser medium strikes a rarer medium at angle of incidence i. The reflected and refracted rays make an angle of 90o with each other The angle of reflection and refraction are r and r \' respectively. The critical angle is ________________.
    Solution

  • Question 5
    4 / -1
    Relation between critical angle of water Cw and that of the glass Cg is _________. (given nw = 4/3, ng = 1.5)
    Solution

  • Question 6
    4 / -1
    The radius of curvature of convex surface of a thin plano–convex lens is 15 cm and refractive index of its material is 1.6 The power of the lens will be___________.
    Solution

  • Question 7
    4 / -1
    A ray of light passes through a prism having refractive index (n = √2), Suffers minimum deviation If angle of incident is double the angle of refraction within prism then angle of prism is____________.
    Solution

  • Question 8
    4 / -1
    An air bubble inside glass slab (n =1.5) appear from one side at 6 cm and from other side at 4 cm. Then the thickness of glass slab is____________cm
    Solution

  • Question 9
    4 / -1
    The magnifying power of objective of a compound microscope is 5.0 If the magnifying power of microscope is 30, then magnifying power of eye–piece will be_________.
  • Question 10
    4 / -1
    Light of certain colour contain 2000 waves in the length of 1 mm in air. What will be the wavelength of this light in medium of refractive index 1.25 ?
    Solution

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