What happens to light rays that pass through a lens?
They are absorbed
They are reflected
They are refracted
What type of lens is thicker in the middle than at the edges?
Convex
Diverging
Concave
Which type of lens causes light rays to diverge?
Converging
Which type of lens is used in a camera?
What type of images do convex lenses form?
Real images only
Both real images and virtual images
Virtual images only
What types of images do concave lenses form?
What name is given to the distance between the lens and the principal focus?
Focal length
Principal length
Principal axis
Which phrase best describes ‘long sightedness’?
Can see objects that are nearby but cannot clearly see objects in the distance
Can’t see objects in the distance or objects that are nearby
Can see distant objects clearly, but cannot clearly see objects that are nearby
Which type of lens corrects the vision of a person who is short sighted?
A convex lens
A concave or a diverging lens
A converging lens
An object is 40 cm away from a convex lens of focal length 10 cm. What type of image will be formed by the lens?
Real, magnified and upright
Real, inverted and diminished
Virtual, upright and magnified