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JEE Main Physics Class 12 Ray Optics and Optical Instruments Part 1 Questions
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Question : 51
Total: 99
A convex lens, of focal length 30 cm, a concave lens of focal length 120 cm, and a plane mirror are arranged as shown. For an object kept at a distance of 60 cm from the convex lens, the final image, formed by the combination, is a real image, at a distance of
[Online April 9, 2016]
60 cm from the convex lens
60 cm from the concave lens
70 cm from the convex lens
70 cm from the concave lens
Validate
Solution:
Len's formula is given by
1
f
=
1
v
−
1
u
For convex lens,
1
30
=
1
v
+
1
60
⇒
1
60
=
1
v
Similarly for concave lens
1
−
120
=
1
v
−
1
40
⇒
1
v
=
1
60
Virtual object
10
c
m
behind plane mirror.
Hence real image
10
c
m
infront of mirror or,
60
c
m
from convex lens.
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