Topic 14

Question 1

How are optical images formed?

Answer 1

Diverging light rays crossing eachother after relaction/refractions

The crossing point is called the image

Question 2

What is a real image?

Answer 2

An image where the image is where it seems to be

Question 3

What is a virtual image?

Answer 3

An image where the obejct isn’t where it seems to be

The rays have been changed (E.g like with a mirror)

Question 4

What is an object? What is a virtual object?

Answer 4

Most are real, the rays come from the location of the object.

Virtual objects occur in a multicomponent system, e.g Mirrors/lenses.

Question 5

Describe the image formed by a plane mirror

Answer 5

The image is the point where the reflected light points at.

Question 6

What are thin lenses?

Answer 6

Small thickness compared with radius

Divergin/converging

Converging → Thicker Centre

Diverging → Thicker outer parts

Question 7

Describe the focal point of a lens

Answer 7

Focus of a converging lens is in front of it (Positive Value)

Diverging lenses’ focus is behind the lens where diverging rays should hit eachother. (Negative Value)

Question 8

Give the lensmaker’s Equation

Answer 8