InterviewSolution
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InterviewSolution
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We combined a convex lens of focal length `f_(1)` and concave lens of focal lengths `f_(2)` and their combined focal length was F . The combination of these lenses will behave like a concave lens, ifA. `F_(1) gt f_(2)`B. `f_(1) lt f_(2)`C. `f_(1) = f_(2)`D. `f_(1) le f_(2)` |
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Answer» Correct Answer - A For combinatio of one convex and one concave lens `(1)/(F)=(1)/(f_(1))-(1)/(f_(2))rArr F=(f_(1)f_(2))/(f_(2)-f_(1))` If `f_(1)gt f_(2)`, then F will be negative. |
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