Question

a plano convex lens and plano concave lens made of same material and having same focal length are kept in contact.an object if height 40cm is placed in front of combination at a distance of 40cm.find it's position of its image​

Answer 1

Explanation:

f=40cm

feq=

80

40×40

=20cm

the image formed when object is placed at the center of curvature is real, inverted and unitly magnified.

c=2f=2×20=40cm