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An eye specialist prescribes spectacles ...

An eye specialist prescribes spectacles having a combination of a convex lens of focal length 40 cm in contact with a concave lens of focal length 25 cm. The power is this lens combination is

A

`+1.5D`

B

`-1.5D`

C

`+6.67D`

D

`-6.67D`

Text Solution

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The correct Answer is:
B
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