Question

The magnifying power of a telescope is high, if its objective and eyepiece have respectively ____________.

विकल्प

• small focal lengths

• large focal lengths

• small and large focal length

• large and small focal length

Answer 1

The magnifying power of a telescope is high, if its objective and eyepiece have respectively large and small focal length.

Explanation:

A telescope's magnification power is determined by

m = `−"f"_0/"f"_"e"`

As a result, when the objective lens has a big focal length and the eye piece has a tiny focal length, the magnifying power will be high.