In the figure, an air lens of radii of curvature 10 cm (\[{{R}_{1}}\] – McqOptions

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1.	In the figure, an air lens of radii of curvature 10 cm (\[{{R}_{1}}\] = \[{{R}_{2}}\] = 10 cm) is cut in a cylinder of glass\[(\mu =1.5)\]. The focal length and the nature of the lens is [MP PET 1995; Pb. PET 2000]
A.	15 cm, concave
B.	15 cm, convex
C.	\[\infty \], neither concave nor convex
D.	0, concave
Answer» B. 15 cm, convex

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