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(B) The two main considerations for an astronomical telescope are its light gathering power and its resolving power.$1$. Light gathering power: This d

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Light gathering power and resolving power

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(B) The two main considerations for an astronomical telescope are its light gathering power and its resolving power.$1$. Light gathering power: This depends on the area of the objective lens. $A$ larger diameter objective allows more light to enter,enabling the observation of fainter objects.$2$. Resolving power: This is the ability of the telescope to distinguish between two objects that are very close to each other in the same direction. It also depends on the diameter of the objective lens.Therefore,the primary goal in designing optical telescopes is to use an objective with a large diameter. However,large lenses are heavy,difficult to support,and expensive to manufacture while maintaining freedom from chromatic aberration and distortions.

Which are two main points important for an astronomical telescope?

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