An object is placed at 50 cm in front of a concave mirror of focal length 20cm.state the nature and size of the image relative to that of the object.
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An object is placed at 50 cm in front of a concave mirror of focal length 20cm.state the nature and size of the image relative to that of the object.
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Explanation:
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