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In which of the following instruments, the objective has a large focal length and a very large eyepiece?

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In which of the following instruments, the objective has a large focal length and a very large eyepiece?

(a) A simple microscope

(b) A Compound microscope

(c) Telescope

(d) Interferometer

The question was asked by my college professor while I was bunking the class.

This intriguing question comes from Optical Instruments topic in chapter Optics of Engineering Physics II

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Correct choice is (c) Telescope

Easiest explanation: In telescopes, it is desired to provide angular magnification of distant objects. A very large focal length and the even larger eyepiece is used so that the light from a distant object enters the objective and the image formed is clear.

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