Question

a concave mirror makes enlarged and erect image of an object . according to sign conventions which of the following measurements are considered as negative measurements? (a) u and f (b) v and f (c) size of the object and size of the image . (d) u and f

Answer 1

answer : option (d) u and f

if an object is placed between pole and focus of concave mirror, image forms enlarged, virtual and erect behind the mirror.

according to sign convention,

• object distance is taken as negative.
• focal length of concave mirror is taken as negative whereas convex mirror is taken as positive.
• size of object is taken as positive.

hence, option (d) object distance and focal length of concave mirror are negative.

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Answer 2

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Answer is (d) u and f

As in concave mirror according to sign conventions :

• Object distance (u) is always negative in case of mirror, and in lens.
• And in case of concave mirror and concave lens we take focal length (f) as negative while in convex mirror as well as in lens focal length is positive.
• Size of object is positive where as image size can be positive and negative according to sign conventions