Physics test investigation

Refraction

The bending of light as it passes through different densities of mediums

Lens

Transparent plastic or glass that has at least one curved side and refracts light

Convex Lenses

• Thicker in the middle

• Converges light rays

• Both real and virtual lenses depending on the position

Concave lenses

• Thinner in the middle

• Diverges light rays

• Virtual, erect and reduced

Near sighted

• The eyeball is too long and the image focuses in front of the retina

• Concave lenses expand focal length

Far sighted

• The eyeball is too short, so the image is focused behind the retina

• Convex lense shortens the focal length

Focus

The specific point where light rays that were travelling parallel to each other meet (converge) after passing through a lens

Focal length

The distance between the center of the lense to the focus

Virtual focus