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56. A convex lens of focal length f produces a real image of size m-times the size of the object. Then the object distance is (NTSE Odisha, Stage-I, 2016-17)

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57. For refraction of light from air to rock salt. Water and diamond if
V - Velocity of light in air
V1 - Velocity of light in rock salt
V2 - Velocity of light in water
V3 - Velocity of light in diamond, then
Choose the correct alternative :
(NTSE Maharashtra, Stage-I, 2016-17)

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58. If the path of parallel light through a concave lens is as shown in the figure, whene η, η1 and η2 are refractive indices, then

(NTSE Maharashtra, Stage-I, 2016-17)

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59. The refractive index of a liquid is 5/3. A ray of light travelling in this liquid falls at interface of liquid and air. At what angle of incidence should it fall on liquid air interface so that it suffers total internal reflection? (NTSE Bihar, Stage-I, 2016-17)

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60. Which of the following cannot form a real image for a divergent beam of light? (NTSE Bihar, Stage-I, 2016-17)

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