Two thin lenses are arranged coaxially in air

PHYSICS · Single correct · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments

Problem

Two thin lenses are arranged coaxially in air. Lens 1 is a converging lens with focal length 12 cm12\,\text{cm}, and Lens 2 is a diverging lens with focal length −18 cm-18\,\text{cm}. The lenses are separated by 40 cm40\,\text{cm}. A 1.5 cm1.5\,\text{cm}-tall object is placed 24 cm24\,\text{cm} in front of Lens 1 (on its left side). What is the height of the final image formed by the two-lens system? (Use a positive height for an upright final image.) (a) +0.79 cm+0.79\,\text{cm} (b) −1.5 cm-1.5\,\text{cm} (c) −0.79 cm-0.79\,\text{cm} (d) −0.71 cm-0.71\,\text{cm}

Related theory

Browse the problem library