Question

A student takes a mirror which is depressed at the centre and mounts it on a mirror stand. an erect and enlarged image of his face is formed. he places the mirror on a stand along a metre scale at 10cm mark. in front of this mirror,he mounts a white screen and moves it back and froth along the metre scale till a highly sharp well defined image of a distant building is formed on the screen at 25.5cm mark. (a)name the mirror and find its focal length. (b)why does the student get sharp image of distant building at 25.5cm mark advertisement ask for details followreport by pawanchhikara2p33xdl 30.01.2018 answers amal14 amal14expert the mirror is a concave mirror and it's focal length is 25.5 cm the image of the distant building is formed at 25.5 cm mark because the light rays coming from the building are parallel to each other and after reflection they converge at the focus point and hence meet at 25.5 cm mark. hence an image is formed at that mark

Answer 1

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