Lenses IGCSE Physics

Which length is the focal length of the lens?

• A

• B

• C

• D

A lens is used to produce a magnified image, as shown in the scale diagram.

What is the linear magnification of the object?

• 0.33

• 3.0

• 4.0

• 6.0

A man is short-sighted.

Which ray diagram shows what happens in his eye when he looks at a distant object?

• A

• B

• C

• D

The ray diagram shows two rays from a point on an object placed in front of a diverging (concave) lens.

What are the properties of the image produced? 

• real and larger than the object

• real and smaller than the object

• virtual and larger than the object

• virtual and smaller than the object

An object is viewed through a concave (diverging) lens.

What is the correct description of the image formed?

• real, inverted, magnified

• real, upright, diminished

• virtual, inverted, magnified

• virtual, upright, diminished

Convex lenses are used in cameras and as magnifying glasses.

Which types of image are formed?

• A

• B

• C

• D

An object is placed in front of a diverging lens as shown on the scale diagram.

The principal focus F is marked on each side of the lens.

What is the position of the image formed by the lens?

• A

• B

• C

• D

In which of the diagrams is the path of the light ray not correct?

• A

• B

• C

• D

A lens forms a blurred image of an object on a screen.

How can the image be made sharp and in focus on the screen?

• by moving the object away from the lens and screen

• by moving the screen away from the lens and object

• by using a brighter object at the same position

• by using a lens of longer focal length at the same position

The human eye has a converging lens system that produces an image at the back of the eye.

An eye views a distant object. What type of image is produced?

• real, erect, same size

• real, inverted, diminished

• virtual, erect, diminished

• virtual, inverted, magnified