CBSE Class 10 Science 2017 · Paper 531 · Question 29
A student determined the focal length of a device ‘X’ by focusing a bright distant object on the screen as shown in the diagram :
According to the diagram, select the correct statement from the following :
- (a)Device ‘X’ is a concave mirror and distance ‘d’ is its focal length.
- (b)Device ‘X’ is a concave mirror and distance ‘d’ is its radius of curvature.
- (c)Device ‘X’ is a convex lens and distance ‘d’ is its focal length.
- (d)Device ‘X’ is a convex lens and distance ‘d’ is its radius of curvature.
Answer
(c) Device ‘X’ is a convex lens and distance ‘d’ is its focal length.
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