The size of the image of an object, which is at infinity, as formed by a convex lens of focal length 30 cm is 2 cm. If a concave lens of focal length 20 cm is placed between the convex lens and the image at a distance of 26 cm from the convex lens, calculate the new size of the image

Options

A. `2.5cm`
B. `5.0cm`
C. `1.25`
D. None

Answer

A

Explanation

`m=(f)/(f+u) rArr (h_(2))/(h_(1))=(-20)/(-20+4)`
`(h_(2))/(-2)=(-20)/(-16) rArr h_(2)=(-20)/(-16)xx2`
`h_(2)=2.5cm`