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Ray Optics And Optical Instruments Quiz-4

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Q31. Find the luminous intensity of the sun if it produces the same illuminance on the earth as produced by a bulb of 10000 candela at a distance 0.3 m. The distance between the sun and the earth is 1.5×1011 m
  •  25×1022 cd
  •  25×1018 cd
  •  25×1026 cd
  •  25×1036 cd
Solution
                       

Q32.Two immiscible liquids of refractive indices 1.5 and 4/3 are filled in glass jar each of length 6 cm. A light of source S is at the bottom of the jar, the apparent depth of light source will be
                                 

  •  12.5 cm
  •  17 cm
  •  12 cm
  •  8.5 cm
Solution
                      



Q33.  A parallel beam of white light falls on a convex lens. Images of blue, yellow and red light are formed on other side of the lens at a distance of 0.20 m,0.205 m and 0.214 m respectively. The dispersive power of the material of the lens will be
  •  619/1000
  •  9/200
  •  14/205
  •  5/214
Solution
                       

             

Q34. A ray of light passes an equilateral prism such that an angle of incidence is equal to the angle of emergence and the latter is equal to 3/4 th the angle of prism. The angle of deviation is
  •  45°
  •  39°
  •  20°
  •  30°
Solution
                              



Q35.Two lenses having f1:f2=2∶3 has combination to make no dispersion. Find the ratio of dispersive power of glasses used
  •  2∶3
  •  3∶2
  •  4∶9
  •  9∶4
Solution
  ω12 =-f1/f2 =-2/3

Q36. A ray of light strikes a transparent rectangular slab (of refractive index √2) at an angle of incidence of 45°. The angle between the reflected and refracted rays is
  •  75°
  • 90°
  •  105°
  •  120°
Solution
                           



Q37.What will be the colour of sky as seen from the earth, if there were no atmosphere
  •  Black
  •  Blue
  •  Orange
  •  Red
Solution
Sky appears blue due to scattering. In absence of atmosphere no scattering will occur

Q38.A convex lens of focal length 1/3 m forms a real, inverted image twice in size of the object. The distance of the object form the lens is
  •  0.5 m
  •  0.166 m
  •  0.33 m
  •  1 m
Solution
                      



Q39.To get three images of a single object, one should have two plane mirrors at an angel of
  •  60°
  •  90°
  •  120°
  •  30°
Solution
                         



Q40. Chromatic aberration of lens can be corrected by
  •  Reducing its aperature
  •  Proper polishing of its two surfaces
  •  Suitably combining it with another lens
  • Providing different suitable curvature to its two surfaces
Solution
Suitably combining it with another lens

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