Thin Converging Lens Part 1

Which of the above represent rays that come from a distant object (object that is very far away)?

• Converging rays

• Diverging rays

• Parallel rays

Name the lens in the diagram.

• Thin converging lens

• Thin diverging lens

Name the horizontal line as shown in the diagram.

• Optical axis

• Optical line

• Principal axis

• Principal line

Name the lens feature labelled as C in the diagram.

• Centre

• Midpoint

• Midway

• Optical centre

What is the scientific name of length f in the diagram?

• Focal length

• Lens length

• Object distance

• Image

Name the lens feature labelled as F in the diagram.

• Image distance

• Focal length

• Focal point

• Principal axis

Focal point is a specific point on the focal plane.

• True

• False

Which distance is equal to the focal length of a lens?

• the distance between a distant object and its image

• the distance between the image of a close object and the centre of the lens

• the distance between the image of a distant object and the centre of the lens

• the distance between two focal points

Light rays passing through the optical centre of a lens are not refracted.

• True

• False

A light ray that is parallel to the principal axis enter a thin converging lens. Would this light ray pass through the focal point of the lens?

• Yes

• No