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 (µ=2/3). The focal length and the nature of the lens is

In the figure, an air lens of radii of curvature 10 cm (R_(1)=R_(2)=10

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 (µ=2/3). The focal length and the nature of the lens is
Answer» 15cm,concave 15 cm,convex `OO`,NEITHER concave nor convex 0,concave Solution :(a) For air LENS in glass, FOCAL LENGTH of air lens, `1/f=(""_(g)µ_(a)-1)(1/R_(1)-1/R_(2))` `=(2/3-1)[1/10-(-1/10)]` `rArr`f=-15 cm

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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 (µ=2/3). The focal length and the nature of the lens is

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