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Q.

In a reflecting telescope, a secondary mirror is used to 

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a

make chromatic aberration zero

b

reduce the problem of mechanical support

c

move the eyepiece outside the telescopic tube 

d

remove spherical aberration

answer is C.

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Detailed Solution

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In telescope parabolic mirrors are used in order to reduce spherical aberration. So that both marginal and paraxial ray meet at same focus.

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