Embed a beam projector inside a container, vary the media in the upper and/or lower half, and rotate the projector to study refraction. Here the beam is going from water into air.
Drag a spray of rays outward from a point source, turn on the "backward extension of rays option" and investigate the formation of an image in a mirror.

General palette with tools to draw single light rays and sprays of light rays, beam projector, point source, rectangular medium, prism, two-media container, blocker, and plane mirrors.

Measurement palette to measure distances, angles and light intensity. There is also a graphics palette.