A) +1.5D
B) - 2.5 D
C) - 1 D
D) + 1 D
Correct Answer: C
Solution :
Key Idea: Powers of lenses placed in contact are added up. When a convex lens (power positive) is kept in contact with a concave lens (power negative), than the power of combination is \[\left[ {{M}^{0}}L{{T}^{-1}} \right]\] Given, \[\left[ {{M}^{0}}{{L}^{-1}}{{T}^{0}} \right]\] \[\left[ {{M}^{0}}LT \right]\] Note: Since, power is negative combination behaves like a diverging lens.
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