Two lenses of power `+ 10 D and - 5 D` are placed in contact, (i) Calculate the focal length of the combination (ii) where should an object be held fr - Sarthaks eConnect

Two lenses of power `+ 10 D and - 5 D` are placed in contact,
(i) Calculate the focal length of the combination
(ii) where should an object be held from the combination so as to obtain a virtual image of magnification `2` ?
A. `5 cm`
B. `-5 cm`
C. `10 cm`
D. `-10 cm`

Two lenses of power `+ 10 D and - 5 D` are placed in contact, (i) Calculate the focal length of the combination (ii) where should an object be held fr

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