Why should the objective of a telescope have large focal length and la

1.	Why should the objective of a telescope have large focal length and large aperture ? Justify your answer.
Answer» The objective of a telescope have large focal length and large aperture so as to have : (i) large magnification as M= - f₀/f_e (ii) bright and sharp image as the amount of light entering depends on aperture size.

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

Answer»

The objective of a telescope have large focal length and large aperture so as to have :

(i) large magnification as M= - f₀/f_e

(ii) bright and sharp image as the amount of light entering depends on aperture size.

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

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