Convex lenses

How do light waves change direction when they move from air into glass?

• They speed up and bend away from the normal.

• They slow down and bend towards the normal.

• They speed up and bend towards the normal.

• They slow down and bend away from the normal.

What is the key characteristic of a convex lens?

• Thicker at the edges than at the center.

• Thinner at the center than at the edges.

• Thicker at the center than at the edges.

• Uniform thickness throughout.

What is the principal focus (F) of a convex lens?

• The point where the central ray passes through the lens.

• The point where all parallel rays refract and converge after passing through the lens.

• The distance from the center of the lens to the principal axis.

• The point where light waves change speed.

When an object is placed at least two focal lengths away from a convex lens, what are the properties of the image formed?

• Magnified, inverted, real.

• Diminished, upright, virtual.

• Diminished, inverted, real.

• Magnified, upright, virtual.

If an object is placed between one and two focal lengths from a convex lens, what type of image is formed?

• Diminished, inverted, real.

• Magnified, upright, virtual.

• Magnified, inverted, real.

• Diminished, inverted, virtual.