An object 20 cm in size, is placed at 50 cm
infront of a Concave miror of focal length 30 cm
At what distance from the mirror would a screen be
placed in order to obtain sharp image
Find the nature and the size of the image.
?
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Answer:Given,
Focal length f=20cm
Image distance, v=50cm
from mirror formula,
f
1
=
v
1
+
u
1
⇒
−20
1
=−
50
1
+
u
1
u
1
=
50
1
−
20
1
=
50×20
20−50
=
1000
−30
u=−
3
100
cm
Explanation:
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