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JEE Main Physics Class 12 Ray Optics and Optical Instruments Part 2 Questions
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© examsnet.com
Question : 58
Total: 112
A convex lens of focal length
20
c
m
is placed in front of a convex mirror with principal axis coinciding each other. The distance between the lens and mirror is
10
c
m
. A point object is placed on principal axis at a distance of
60
c
m
from the convex lens. The image formed by combination coincides the object itself. The focal length of the convex mirror is ___
c
m
.
[25-Jul-2022-Shift-2]
Your Answer:
Validate
Solution:
1
v
+
1
u
=
1
f
1
v
−
1
−
60
=
1
20
1
v
=
−
1
60
+
1
20
=
−
1
+
3
60
=
2
60
⇒
v
=
+
30
c
m
∴
Radius of curvature of mirror
=
30
−
10
=
20
c
m
⇒
f
mirror
=
20
2
=
10
c
m
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