1.

One surface of a lens is convex and the other is concave. If the radii of curvature are r1 ​and r2 ​respectively, then the lens will be convex if

Answer»

One surface of a lens is convex and the other is concave. If the radii of curvature are r1 ​and r2 ​respectively, then the lens will be convex if




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