. A student used a device (X) to obtain/focus X the image of a well illuminated distant building on a screen
(A) This device is a concave lens of focal length 8 cm
(B) This device is a convex mirror of focal length 8 cm.
(C) This device is a convex lens of focal length 4 cm.
(d) This device is a convex lens of focal length 8 cm.
Best Answer
Ans. (d) This device is a convex lens of focal length 8 cm.
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