A student determines the focal length of a device 'A' by focussing the image of a far off object on a screen placed on the opposite side
A student determines the focal length of a device 'A' by focussing the image of a far off object on a screen placed on the opposite side of the object. The device 'A' is :
(a) Concave lens
(b) Concave mirror
(c) Convex lens
(d) Convex mirror
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Correct answer is (c) Convex lens
When object is at infinity image is formed on the other side of convex lens.
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