Question

Draw a labelled ray diagram to show the image formation by an astronomical telescope in the near point adjustment.

Or

Draw a ray diagram to illustrate image formation by an astronomical telescope used in near point position.

Or

Draw a ray diagram of an astronomical telescope in the normal adjustment position. Write down the expression for its magnifying power.

Answer 1

Image of the near object can be formed at infinity or at D.

Image of near object at infinity.

Magnifying power for normal adjustment

M = \(-\frac{f_0}{f_e}\)

Image formed at least distance of distinct vision.