(i) Draw a neat labelled ray diagram of an astronomical telescope in normal adjustment. Explain briefly its working.

Question 1

(ii) An astronomical telescope uses two lenses of powers 10D and 1D. What is its magnifying power in normal adjustment?

Question 2

(i) Working: Suppose AB is the point object whose end A is on the axis of telescope. The objective (L1) forms image A'B' of object AB at the second principal focus F0 . The image A'B' is real, inverted and diminished. For normal adjustment position this image also at first focus (Fe ) of eye lens (L2). This image acts as an object for eye lens and final image is formed at infinity. The final image AB (say), is magnified and inverted.

diagram of an astronomical telescope

kratos · Answer 1 · 2021-01-16T03:27:14+0000

(i) Working: Suppose AB is the point object whose end A is on the axis of telescope. The objective (L1) forms image A'B' of object AB at the second principal focus F0 . The image A'B' is real, inverted and diminished. For normal adjustment position this image also at first focus (Fe ) of eye lens (L2). This image acts as an object for eye lens and final image is formed at infinity. The final image AB (say), is magnified and inverted.

diagram of an astronomical telescope

(i) Draw a neat labelled ray diagram of an astronomical telescope in normal adjustment. Explain briefly its working.

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(i) Draw a neat labelled ray diagram of an astronomical telescope in normal adjustment. Explain briefly its working.

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1 Answer

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