Rankers Physics

Optical Instruments: Practice Problem & Solution

A lens of large focal length and large aperture is best suited as an objective of an astronomical telescope since: (2021)
a large aperture contributes to the quality and visibility of the images.
a large area of the objective ensures better light gathering power.
a large aperture provides a better resolution.
all of the above.

Solution Explained:

To solve this problem, we apply the core principles of Optical Instruments. Understanding the underlying formula is key to arriving at the correct answer below:

A large aperture objective collects more light, which increases the light gathering power, making faint distant objects visible. It also inherently increases the resolving power of the telescope, allowing finer details to be resolved. Therefore, all the given statements are correct.

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