A convex lens of Focal length of 40cm is...

A convex lens of Focal length of 40cm is in contact with a concave lens of focal length 25cm. The power of the combination is.

A

`- 1.5 ` dioptress

B

`-6.5 ` dioptress

C

`+6.5 ` dioptress

D

`+ 6.67 `dioptress

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The correct Answer is:

A

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