Question

Considering the correlation between the words of the first pair, pair the
third word accordingly with proper answer:
Observation of stars and planets : Telescope : : Repairing a watch​

Answer 1

Observation of stars and planets : TELESCOPE :: Repairing a watch : SIMPLE MICROSCOPE

Why and how ?

• Telescopes have a high magnification power of around 50-100X using two lens in different positions.

• Hence, they are used in astronomical studies and used in observation of stars and planets.

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• However, simple microscopes contain a single lens in the form of an eye-piece.

• This single convex lens provides an magnification of 10-20X.

• This small magnification is enough to look into the small parts located inside the watches.

• A single lens is also easier to wear like a spectacle around the eye and use it during reparing of watches.

• These spectacles also have a small light source attached to it, so that the inner parts of the watch can be clearly seen.

$\star$ Hope It Helps.