CBSE Class 12 Physics 2017 Delhi Set 2 Paper

Question : 3 of 8

Marks: +1, -0

Why should the objective of a telescope have large focal length and large aperture? Justify your answer.

Solution:

Reasons for having large focal length and large aperture of objective of telescope and their justification.

Large focal length : to increase magnifying power

( ∵ m=\;{f_0}/{f_e})

Large aperture : to increase resolving power.

1 \/ 2

( ∵ {\RP}=\;{2 a}/{1.22 λ})

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