Question

A student wanted to pick up a concave mirror from three mirrors A, B, C lying

on a table to find its focal length. He looks into mirror A, he finds his image

enlarged and erect. When he looks in mirror B, his image is diminished and

erect. When he looks in mirror C, his image is erect and of same size. Find the

correct identification of A, B, C in respective order.

Q.15. A piece of wire of resistance 20  is drawn out so that is length is increased to

twice its original length. Calculate the resistance of the wire in the new situation​

Answer 1

He should pick up mirror A

as when the object is placed between pole and focus in case of a concave mirror only an enlarged image is formed which is virtual and erect.

B will not because

in the information provided in case of convex mirror be is that the image is diminished and erect

C will not because

according to me you are in class 10th and at your level there are only convex and concave mirror in the syllabus and according to this same size image formed cannot be of erect nature.

to where i mind what I learnt in my class 10th would that the real and inverted image is formed which is of the same size as that of object.

convex mirror can only produced give diminished or highly diminished images.

so it will be worthless to choose mirror c

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