Q. A concave and convex lens have the same focal length of 20 cm and are put into contact to form a lens combination. The combination is used to view an object of $5\ cm$ length kept at 20 cm from the lens combination. As compared to the object, the image will be
A) Magnified and inverted
B) Reduced and erect
C) Of the same size as the object and erect
D) Of the same size as the object but inverted
Explanation
(c) Resultant focal length $= \infty$
$\therefore\ $It behaves as a plane slab of glass
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.