A doctor examines a mole with a 15cm focal length glass held

A doctor examines a mole with a 15-cm focal length glass held 12.5 cm from the mole.

d₀ = 12.5 cm

A.) What is the image distance for this configuration in meters?

B.) What is the magnification?

C.) How big is the image of a 5.00 mm diamter mole in milimeters?

(PLEASE BOLD ANSERS)

Solution

(a) image is virtual and is on the side of the mole at a distance of 75 cm

(b) magnification, m = v/u = 6

(c) diameter of image of mole = 6 x 5 = 30 mm