Optics > lenses

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.

Simple demonstration of how the magnifying glass works.

Finding the position and size of the image in a magnifying glass, and hence the magnification.

Making a model microscope and measuring its magnification. 

Using two convex lenses to make a simple astronomical telescope.

Measuring magnification by direct comparison of object and image.

Placing the final image at reading distance from the eye, as an astronomer would.

A flask and lenses are used to show short and long sight and their correction.

Simulating long and short sight using a bowl and lens.

A demonstration to show the inversion of an image on the retina, and a model to show how the shadow forms.

Using a model eye to show the retinal shadow created by an object close to the eye.

Estimating the near point and far point for the human eye.

A model eye that demonstrates how accommodation occurs.

Mimicking the behaviour of short and long sight and its correction.