Question
A student focused the Sun rays using an optical device 'X' on a screen S as shown.
From this it may be concluded that the device 'X' is a (select the correct option).
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Convex lens of focal length 10 cm.
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Convex lens of radius of curvature 20 cm
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Convex lens of focal length 20 cm
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Concave mirror of focal length 20 cm
Solution
A.
Convex lens of focal length 10 cm.
Optical device ‘X’ is a convex lens as sun rays are focused on the screen.
