Answer to Question #341277 in Optics for Muskan

Question

An object is placed at a distance of 4.5 cm to the left of a convex lens A of focal length 4 cm . The screen is removed and the image is used as an object for diverging lens B of focal length 2 cm so that a real image is formed at a distance of 8 cm from lensB .

Find distance between lens A and lens B.

Answer 1

$d=f-\frac{R_1R_2}{R_1-R_2}=0.5~cm.$