An eye specialist prescribes spectacles having a combination of a conv – InterviewSolution

1.	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 of this lens combination in Dioptre is:
Answer» 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 of this lens combination in Dioptre is:

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