A student obtained a sharp image of a candle flame placed at the distant end of the laboratory t...

A student obtained a sharp image of a candle flame placed at the distant end of the laboratory table on a screen using a concave mirror to de determine its focal length. The teacher suggested him to focus a distant building about 1 km far from the laboratory, for getting more correct value of the focal length. In order to focus the distant building on the same screen the student should slightly move the:
Class: 10
Subject: PHYSICS
Chapter: LIGHT-REFLECTION AND REFRACTION
Board:CBSE
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