A) -6.5D
B) +6.5D
C) -1.5D
D) +1.5D
Correct Answer: C
Solution :
Power of convex lens \[{{P}_{1}}=\frac{1}{f(metre)}D\] \[=\frac{1}{0.40}-+2.5D\] Power of concave lens \[{{P}_{2}}=\frac{1}{(-0.25)}D=-4D\] \[\therefore \]Power of combination (in contact) \[P={{P}_{1}}+{{P}_{2}}\] \[=+2.5D-4D=-1.5D\]You need to login to perform this action.
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