| 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 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: |
| (a) mirror away from the screen |
| (b) screen away from the mirror |
| (c) screen towards the mirror |
| (d) screen towards the building |
Answer:
(c) screen towards the mirror
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