Optics > light

Shadows form on a screen when objects interrupt the light from a lamp.

A light ray can be seen in water coloured with fluorescein.

A ray of light bends as it passes through a region of changing refractive index.

Comparing the paths of a reflected ray of light and a rubber ball.

Shows rays forming an image in the smoke with a lens and a mirror, as well as the effects of chromatic and spherical aberration.

Investigating the formation of real images. 

A set of experiments to introduce real and virtual images formed by a convex lens.

Making rough measurements to check the validity of a lens formula.

A group of short, introductory experiments to investigate the behaviour of concave and convex lenses using rays of light.

More introductory experiments investigating the behaviour of concave and convex lenses with rays of light.

A simple model of a camera, demonstrating image formation, focus and the effect of aperture on depth of field.

A model camera using lamps, to investigate depth of field and magnification.

Using lamps to model a telescope and measure its magnification.

Using an intermediate lens to widen the field of view and to invert the image, producing a terrestrial telescope.

Using a lamp to model the passage of rays through a microscope.

Using a lamp to model the passage of rays through a microscope.

Identifying that the image in a plane mirror is virtual.

Shows that image and object positions are symmetrical in a plane mirror.

Showing angle of incidence equal to angle of reflection.

The caustic curve and how the aberration can be reduced by reducing the aperture.

This experiment is well worth the effort of setting it up.

This can be shown to a sixth form class as a fun demonstration of light interference.

Students use a diffraction grating as a tool for observing the spectra from a variety of light sources.