CBSE Class 10 Answered
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 | 30 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 | 30 Jan, 2012, 04:42: PM
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