0
You visited us 0 times! Enjoying our articles? Unlock Full Access!
Question

An object is placed at a distance of 15 cm from a convex lens of focal length 10 cm. On the other side of the lens, a convex mirror is placed at its focus such that the image formed by the combination coincides with the object itself. The focal length of the convex mirror is :
  1. 20cm
  2. 100cm
  3. 25cm
  4. 30cm

A
100cm
B
20cm
C
25cm
D
30cm
Solution
Verified by Toppr

For the lens,

1v1u=1f

1v=110115

Thus, v=30cm

Now, for the mirror, this image acts as the object.

u=3010=20cm

Also, v=25cm
Hence,

125+120=1f

f=100cm

Was this answer helpful?
1
Similar Questions
Q1
An object is placed at a distance of 15 cm from a convex lens of focal length 10 cm. On the other side of the lens, a convex mirror is placed at its focus such that the image formed by the combination coincides with the object itself. The focal length of the convex mirror is :
View Solution
Q2
A point object is placed at a distance of 12 cm on the axis of a convex lens of focal length 10 cm. On the other side of the lens, a convex mirror is placed at a distance of 10 cm from the lens such that the image formed by the combination coincides with the object itself. The focal length of the convex mirror is
View Solution
Q3

A point object is placed at a distance of 12 cm on the axis of a convex lens of focal length 10 cm. On the other side of the lens, a convex mirror is placed at a distance of 10 cm from the lens such that the image formed by the combination coincides with the object itself. What is the focal length of the convex mirror?


View Solution
Q4
An object is placed at a distance of 15 cm from a convex lens of focal length 10 cm. On the other side of the lens, a convex mirror is placed such that its distance from the lens equals focal length of the lens. The focal length of the convex mirror is
View Solution
Q5
A point object is placed 30 cm from convex lens of focal length 20 cm. A convex mirror of radius of curvature 12 cm is placed at distance 6×n cm away from lens on other side. If image coincides with object n is
View Solution