How would you arrange these lenses to form a magnified imageof the Moon? a. as a

Question

How would you arrange these lenses to form a magnified imageof the Moon? a. as a telescope with f obj.=21.4cm and feyepiece=2.55 cm Please help! I'm soconfused! b. as a telescope with fobj.=2.55cm and f eyepiece=21.4cm

Part B:
What is the maximum angular magnification these lenses couldproduce?

Part C:
How would you arrange the same two lenses to form a magnified imageof an insect?
a. as a microscope with f obj.=2.55 and f eyepiece=21.4
b. as a microscope with f obj.=21.4 and f eyepiece=2.55

Part D
If you use the magnifier of part C to view an insect, what is theangular magnification when the insect isheld 2.85 from the objective lens?

Explanation / Answer

A. Choice (a) fo = 21.4 cm and fe = 2.55 cm B. M = fo/fe = 21.4/2.55 = 8.39 C. icroscope of fo = 2.55 cm and elyepiece of fe = 21.4cm D. u = 2.85 cm; v = u.fo/(u-fo) = 7.27 cm        m1 = v/u = 7.27/2.85=2.55        m2 = 1 + D/fe = 1 +25/21.4 = 1+ 1.168 = 2.168 Total M =m1xm2 = 2.55x2.168 = 5.53

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