1 (10 points) A biconcave lens (n = 1.5) has radii 10 cm and 50 cm, respectively, and an axial

thickness of 5 cm. A 2-cm tall object is placed 10 cm from the first vertex. Locate the image of

the object by ray tracing and describe it. Calculate the image location by thin-lens equation and

compare with your ray-tracing results.

2 (10 points) Two positive lenses with focal lengths of 0.30 m and 0.50 m are separated by a

distance of 0.20 m. A small butterfly rests on the central axis 0.50 m in front of the first lens.

Locate the resulting image with respect to the second lens. Using lens equation and ray tracing.