Sunita takes a mirror which is depressed at the centre and mounts it o

1.	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 along 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. (i) Name the mirror and find its focal length. (ii) Why does Sunita get sharp image of the distant building at 35 cm mark?
Answer» (i) Concave mirror ; f = 35 - 15 = 20 cm (ii) Because the incident rays parallel to each other after reflection from concave mirror meets at focus and produce sharp image at focus.

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 along 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. (i) Name the mirror and find its focal length. (ii) Why does Sunita get sharp image of the distant building at 35 cm mark?

Answer»

(i) Concave mirror ; f = 35 - 15 = 20 cm

(ii) Because the incident rays parallel to each other after reflection from concave mirror meets at focus and produce sharp image at focus.

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