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. 1. Name the mirror and find its focal length. 2.Why does Sunita get sharp image of the distant building at 35 cm mark?
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1. 35 - 15 = 20cm
2. because the incident Ray's parallel to each other after reflection from cabbage mirror meet at focus and produce sharp image at focus.
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shreydoda14:
in a scale
the mirror was at 15cm mark and screen at 35 cm
please explain
from infinity rays meet at focus that is where the sheet is placed
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Answered by
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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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