Question

How does the magnifying power of a telescope changes on increasing the linear diameter of its objective?
(A) Power increases on increasing diameter
(B) Power decreases on decreasing diameter
(C) Power remains constant on increasing diameter
(D) Power do not depends on diameter​

Answer 1

Answer:

Magnifying power does not depend on the diameter of Telescope Object. So There is no Effect .

Answer 2

Magnifying power does not depend on diameter (Option d)

• magnifying power of any telescope can be written as  $-\frac{f_{0} }{f_{e} } (1+\frac{f_{e} }{D} )$where f0 is the focal length of the objective and fe is the focal length of the eyepiece and here D is the smallest distance for the clear vision of the clear eye.

• So Magnifying power does not depend upon the diameter so increasing or decreasing can not affect it.

• But increasing diameter can drastically affect the resolving power and Resolving power can be described as = D/1.22λ here λ is the diameter for the light which is incidents on the surface and for this equation D is the diameter of the telescope; Thats why Resolving Power increases when we increase the diameter.

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