Solve

Guides

Question

Image of an object at infinity is formed by a convex lens of focal length 30 cm such that the size of the image is 2 cm. If a concave lens of focal length 20 cm is placed in between the convex lens and the image, at a distance 26 cm from the convex lens, size of the new image is:

Open in App

Solution

Verified by Toppr

Hence, for concave lens, u=4 cm

Given, f=−20 cm

From lens formula,

1v−1u=1f

1v=14+1−20=420

v=5 cm

Magnification of lens, m=vu=54

Magnification of lens, m=hIho

⟹hI=2×1.25=2.5 cm

Was this answer helpful?

1