7) For the same curvature focal length of concave and convex mirror are........ a)equal b) un equal c)equal but opposite d) un eq
7) For the same curvature focal length of concave and convex mirror are........ a)equal b) un equal c)equal but opposite d) un eq
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The magnitude of the focal length are the same. But the focal length of concave is positive and the concave focal length is negative. The positive and negative sign are important in the mirror equation.
option (c) is correct.
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