Physics-
General
Easy
Question
In the figure, an air lens of radii of curvature 10 cm (
= 
= 10 cm) is cut in a cylinder of glass
. The focal length and the nature of the lens is
- 15 cm, concave
- 15 cm, convex
, neither concave nor convex
- 0, concave
, neither concave nor convex
The correct answer is: 15 cm, concave
, so behaves as concave lens.
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