In the figure an air less of raddi of cu...

In the figure an air less of raddi of curvature 10 cm `(R_1 = R_2 = 10 cm)` is cut in a cylinder of glass (n = 1.5). The focal length and the nature of the lens is

15 cm, concave

15 cm, convex

`infty, neither concave nor convex.

0, concave

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