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Question: In a Cassegrain telescope, which employs two mirrors has the mirrors placed 20mm apart, what is the location of the final image for an object at infinity if the radius of curvature of the large mirror is 220mm and the small mirror is 140mm?

Options

  1. AThe final image is formed at 315mm from the larger mirror.
  2. BThe final image is formed at 315mm from the smaller mirror.
  3. CThe final image is formed at 360mm from the larger mirror.
  4. DThe final image is formed at 360mm from the smaller mirror.

Correct answer

B. The final image is formed at 315mm from the smaller mirror.

Step-by-step solution

Correct Option is : (B) The final image is formed at 315mm from the smaller mirror.

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