A plano-convex lens 
has a radius of curvature R = 15 cm and is placed at a distance z from a concave lens of focal length 20 cm as shown. At what distance x 0 should a point object be placed from the plano-convex lens, so that position of the final image is independent of z?
Text Solution
Verified by ExpertsThe correct answer is:
B
30 cm
The position of the final image will be independent of z, only if the rays of light are incident on the concave lens as a beam parallel to the principal axis. This will be possible only when the object is kept at focus of the plano-convex lens.
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems
A large temple has a depression in one wall. On the floor plan, it appears as an indentation having…
A point object is placed on the principal axis of a concave mirror, at a distance of 15 cm from the…
A point source of light is placed at a distance h below the surface of a large deep lake. Neglectin…
A lens forms a real image of an object at a distance of 20 cm. It is observed that on placing anoth…
An object is placed at a distance of 40 cm from a convex lens of focal length 20 cm. On the far sid…
A glass prism is immersed in water as shown in the figure. When a beam of light incident is inciden…