An object of size 7cm is placed at 27 cm in front of a concave mirror of focal length
18cm. At what distance the screen should be placed from the mirror so that a sharp
image can be obtained?.Find the size and nature of the image.
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Answer:
Image will be real and inverted and will be of size 14 cm.
ANSWER
Mirror formula :
v1+u1=f1...........(1)
So, u=−27cm
Concave mirror have negative focal length.
f=−18cm
Putting the values in (1),
v1+−271=−181
We get , v=−54cm
Also,
Magnification = h1h2=u−v
7.0h2=−−27−54
h2=−14.0cm
Image will be real and inverted and will be of size 14 cm.
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