A parallel beam of light is incident on a system of three thin lenses with a common…

PHYSICS · Subjective · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments

Problem

A parallel beam of light is incident on a system of three thin lenses with a common optical axis. The focal lengths of the lenses are

f_1=+10\ \text{cm}

f_2=-20\ \text{cm}

, and

f_3=+9\ \text{cm}

, respectively. The distance between the first and second lenses is

15\ \text{cm}

, and that between the second and third lenses is

5\ \text{cm}

. Find the position of the point at which the beam converges when it leaves the system of lenses.