A reflecting telescope typically consists of two mirrors. Since the magnificatio

Question

A reflecting telescope typically consists of two mirrors. Since the magnification for an object at infinity, imaged at the focus of a concave spherical mirror is not very large, typically a second convex mirror is placed m front of the focus and the light is redirected to an image plane behind the first mirror as shown in the figure below. This increases the magnification, but now a hole has to be cut in the first mirror, so that the light can reach the image plane and a camera can be placed at the image plane to take a picture. How does the hole and obstruction of the second mirror on the optical axis of the first spherical mirror affect the image?

Explanation / Answer

answers could be b) and c) because of obstruction of the second mirror. There are two obstruction fold's: First, it limits the amount of light received by the instrument, and, secondly, it modifies the contrast and resolution of the image

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