A compound lens is made up of two lenses in contact having powers +12.5 and -2.5. an object is placed 15cm from this compound lens.Find the position and nature of the image formed?

Asked by  | 30th Jan, 2012, 04:06: PM

Expert Answer:

1/f = 1/f1 + i/f2 1/f = 1/ (12.5) + 1/(-2.5) 1/f = -40/125 1/f = 1/di + 1/do -40/125 = 1/di + 1/15 1/di = -40/125 -1/15 di = -25/3 Image form will be erect and virtual image.

Answered by  | 30th Jan, 2012, 04:42: PM

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