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Listed under:  Focus (Optics)

### Optics and refraction: focal point

Look at light rays magnified by a lens. Notice how light converges after it leaves the lens. Examine how curvature and thickness of a lens affect focal length. This learning object is one in a series of three objects. The series is also packaged as a combined learning object.

### Optics and prisms

Position a prism to split white light into its component colours. Predict the seven colours that will be produced. Test whether the colours seen are affected by the prism material: glass, flint glass or diamond. Explore whether filters add or remove colours from the spectrum. This learning object is a combination of three ...

### Optics and prisms: split light

Position a prism to split white light into its component colours. Predict the seven colours that will be produced. Explain why dispersion occurs. This learning object is one in a series of three objects. The series is also packaged as a combined learning object.

### Optics and prisms: materials

Position a prism to split white light into its component colours. Test whether the colours seen are affected by the prism material: glass, flint glass or diamond. Explain why dispersion occurs in all of the prism materials. This learning object is one in a series of three objects. The series is also packaged as a combined ...

### Optics and prisms: coloured light

Position a prism to split white light into its component colours. Explore whether filters add or remove colours from the spectrum. This learning object is one in a series of three learning objects. The series is also packaged as a combined learning object.

### Eyeball challenge: stone wheel puzzle

Investigate a range of animal eyes: dog, cat, bee, fish, eagle and human. Discover how these animals see things in different ways because their eyes have different structures. For example, look at an animal's field of view, how it focuses and sees colours. Choose eyes with good close-up vision to solve a puzzle and unlock ...

### Eyeball challenge: mission 2

Investigate a range of animal eyes: dog, cat, bee, fish, eagle and human. Discover how these animals see things in different ways because their eyes have different structures. For example, look at an animal's field of view, how it focuses and sees colours. Find your way through an ancient temple by choosing eyes suited ...

### Far out lenses

Look at the Moon through a simple telescope. Adjust the focal length of two convex lenses and compare the results. Explore relationships between optical variables such as focal length, position of objective lens, convexity, image inversion and lens size. This learning object is one in a series of two learning objects. The ...