Ray-Optics-And-Optical-Instruments-Quiz-4

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
  ω₁/ω₂ =-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