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

Question: A compound lens is made of two lenses in contact having powers +12.5 D and -2.5 D. An  object is placed at 15 cm from this compound lens.Find the position and nature of the image formed.
Answer: Pcomp = P1 +P2 = + 10 D
Fcomp  = 100/10 cm
1/F =1/v - 1/u
F = +10 cm, u = -15 cm, v = ?                                                             
  V= +30 cm 

Image formed will be real inverted and enlarged.

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