CBSE Class 10 Science 2017 · Paper 31/2/1 · Question 30
An optical device has been given to a student and he determines its focal length by focusing the image of the sun on a screen placed 24 cm from the device on the same side as the sun. Select the correct statement about the device.
- (a)Convex mirror of focal length 12 cm
- (b)Convex lens of focal length 24 cm
- (c)Concave mirror of focal length 24 cm
- (d)Convex lens of focal length 12 cm
Answer
(c) Concave mirror of focal length 24 cm
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