15. A virtual image three times the size of the object is obtained with a concave mirror of radius of curvature 36 cm. The distance of the object from the mirror is
(a) 20 cm (b) 10 cm (c) 12 cm (d) 5 cm
Answers
Answered by
6
Option C 12 cm
It is given that,
Magnification
m=3
m=
u
−v
f=
2
R
=−18cm
It is given that a virtual image three times the size of the object is obtained with a concave mirror. So, v=−3u
From mirror’s formula
v
1
+
u
1
=
f
1
3u
−1
+
u
1
=
−18
1
u=−12cm
The distance of the object from the mirror u=12cm in front of concave mirror.
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Answered by
0
Answer:
We are given the radius of curvature of the mirror, which is R = 36 cm. But since the mirror is concave, the radius of curvature will have a negative sign. Therefore, R = - 36 cm.
Explanation:
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