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10 Question answer on optical instruments 1.        A person wants to see two pillars distance 11 km separately. The distance between the pillars be approximately (a)     3.2 m (b)    1 m (c)     0.25 m (d)    0.5 m Ans: (a) 2.        When the length of a microscope tube increases, its magnifying power (a)     Decreases (b)    Increases (c)     Does not change (d)    May increase or decrease depend on the observer and the place of observation? Ans: (a) 3.        The focal length of the objective of microscope is: (a)     Greater than the focal length of the eye piece (b)    Less than the focal length of the eye piece (c)     Equal to than the focal length of the eye piece (d)    Arbitrary Ans: ( a) 4.   ...