Question

A doctor examines a mole with a 14.5 cm focal length magnifying glass held 14.0 cm from the mole.

(a)

Where is the image? (Enter the image distance in meters. Include the sign of the value in your answer.)

m

(b)

What is its magnification?

(c)

How big in millimeters is the image of a 4.50 mm diameter mole?

mm

Answer 1

For the magnifying lens we always use covex lens and for a convex lens if u be the object distance , v be the image distance and f be the focal length then we know

The magnification id given by