A telescope changes (usually enhances) the angular magnification of far-away objects. In the diagram below a telescope is made from two convex lenses of focal lengths 50 cm and 10 cm respectively.

a) By ray diagram show that when the lenses are 60 cm apart from each other, the telescope images an object at infinity to an image at infinity. b) What is the magnification power of the telescope? c) Alicia wears contact lenses of strength -2 Diopter. The telescope above is adjusted such that she can see a faraway tree fine with her contact lenses on. Today she forgot to wear her lenses and the image of the tree appears to be blurry to her. How much should she adjust the separation between the lenses so that she can see the image of the tree with her relaxed eyes? (When her eye is placed immediately after the 10cm lens)

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