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JEE Main 8 Apr 2019 Paper 2 Solved Paper
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© examsnet.com
Question : 24
Total: 90
A convex lens (of focal length 20 cm) and a concave mirror, having their principal axes along the same lines, are kept 80 cm apart from each other. The concave mirror is to the right of the convex lens. When an object is kept at a distance of 30 cm to the left of the convex lens, its image remains at the same position even if the concave mirror is removed. The maximum distance of the object for which this concave mirror, by itself would produce a virtual image would be
10 cm
20 cm
30 cm
25 cm
Validate
Solution:
1
V
−
1
(
−
30
)
=
1
20
⇒
1
V
=
1
20
−
1
30
⇒
V
=
60
c
m
Focal length of concave mirror is 10cm
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