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JEE Mains Model Paper 22
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© examsnet.com
Question : 19
Total: 90
A convex lens at focal length 15 cm placed coaxially in front of a convex mirror. The lens is 5 cm from apex of mirror. When an object is placed on the axis at a distance 20 cm from the lens, it is found that image coincides with object, radius of curvature of mirror is
65 cm
60 cm
55 cm
75 cm
Validate
Solution:
1
v
-
1
−
20
=
1
15
⇒ y = 60 cm
Since object coincides with image, centre of curv ature of mirrormust coincide with image of convex lens so that rays fall normally on mirror and then return along their original path.
R = 60 - 5 = 55 cm
© examsnet.com
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