Sunita takes a mirror which is depressed at the centre and mounts it on a mirror stand. An erect and enlarged image of her face is formed. She places the mirror on a stand aJong a meter scale at 15 cm mark. In front of this mirror, she mounts a white screen and moves it back and forth along the meter scale till a sharp, well-defined inverted image of a distant tree is formed on the screen at 35 cm mark. j. Name the mirror and find its focal i j. length. Why does Sunita get sharp image of the distant building at 35 cm mark?
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Answer:
( i )
Sunita used concave mirror.
Focal length of mirror is :
= > 35 cm - 15 cm
= > 20 cm .
( ii )
As we know concave mirror always form image at focus when object is placed at infinity. Hence image is form sharp image at it was placed at 35 cm .
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