Converging lens

The ray diagram shows the image of an object formed by a converging lens. What is the focal length of the lens?

• 40 cm

• 50 cm

• 72 cm

• 90 cm

A parallel beam of light falls on a converging lens.

Which diagram shows what happens to the beam of light?

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A student draws a diagram representing three rays of light from point P passing through a converging lens. Each point labelled F is a principal focus of the lens.

Which of the rays has the student drawn correctly?

• ray X and ray Y

• ray X and ray Z

• ray Y only

• ray Z only

Which labelled distance is the focal length of the lens?

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Which statement about a converging lens is not correct?

• A ray parallel to the principal axis of the lens is refracted through the principal focus.

• All rays of light refracted by the lens pass through the principal focus.

• The distance between the centre of the lens and the principal focus is the focal length.

• The principal focus of the lens is a point on the principal axis.

An object is placed in front of a converging lens. The lens has a focal length f.

The lens produces a real, enlarged image of the object.

In which labelled position is the object placed?

• A

• B

• C

• D

Which diagram shows how an image of an object is formed on a screen by a converging lens?

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The diagram represents a converging lens forming an image of an object.

Which distance is the focal length of the lens?

• PQ

• PR

• QR

• QS

The diagram shows a converging lens forming an image of an object.

Which statement about the image is correct?

• It is real and can be seen by an eye at X.

• It is real and can be seen by an eye at Y.

• It is virtual and can be seen by an eye at X.

• It is virtual and can be seen by an eye at Y.

An object O is placed close to a thin converging lens.

The diagram represents three rays from the top of O passing through the lens.

Which type of image is produced by the lens when the object O is in this position?

• real and diminished

• real and enlarged

• virtual and diminished

• virtual and enlarged