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Spectacles have a wide variety of lens types.

Light - Lenses 03

In GCSE Physics you explore how lenses bend light to form images. This quiz focuses on cameras, magnifiers and other devices that rely on refraction.

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Fascinating Fact:

Cameras, magnifying glasses, projectors, and the eye all rely on lenses to form images by controlling the refraction of light.

In GCSE Physics, you learn how different lenses bend light, form real and virtual images, and help us understand devices like cameras, projectors, microscopes and the human eye.

Key Terms

Refraction: The change in direction of light as it passes from one transparent medium into another.
Lens: A shaped piece of transparent material that bends light rays to form an image.
Principal focus: The point where rays parallel to the principal axis appear to meet after passing through a lens.

Frequently Asked Questions (Click to see answers)

How do lenses form images in GCSE Physics?

In GCSE Physics, lenses form images by refracting light. Rays are bent as they pass through the lens so that they either meet at a point to form a real image, or appear to come from a point to form a virtual image.

What is the role of lenses in cameras and the human eye?

In cameras and the human eye, lenses focus light onto a surface. In a camera this is the sensor, while in the eye it is the retina. Adjusting the lens or its position helps to keep the image sharp.

Why do we revise lens diagrams and image formation for GCSE exams?

You revise lens diagrams and image formation because exam questions often ask you to predict where an image forms, whether it is real or virtual, and how its size changes when the object distance is altered.

Try These Related Quizzes

Please click on any of the smaller images below to get a larger picture.

1 .

Which 2 labelled parts of the eye diagram are responsible for focussing light?

Cornea and retina

Pupil and lens

Iris and lens

Cornea and lens

The cornea is a meniscus lens

2 .

What type of lens is shown in the diagram?

Concave

Complex

Convex

Complicated

Since it is convex on both sides, it is a bi-convex lens

3 .

What type of lens is shown here?

Concave

Complex

Convex

Complicated

Since it is concave on both sides, it is a bi-concave lens

4 .

The image produced by the lens shown in the diagram will be…

real and inverted

virtual and upright

real and upright

virtual and inverted

An image is called virtual when it is formed where the rays appear to come from, and you can only see the image when you look into the lens from the side opposite to the object

5 .

The image produced by the lens shown in the diagram will be…

smaller than the object and the same way up

larger than the object and the same way up

smaller than the object and upside down

larger than the object and upside down

This is how a magnifying glass works

6 .

Why is the image produced in this diagram larger than the object?

The height of the image is longer than the focal length

The focal length is longer than the height of the object

The object is further from the lens than the principal focus

The object is nearer to the lens than the principal focus

The rays of light that pass through the lens are diverging, making the image seem larger than the object

7 .

What type of image will be produced by the lens shown in the diagram?

Virtual and same size

Real and same size

Real and diminished

Virtual and enlarged

To form a real image using a converging lens, the object has to be beyond the principal focus of the lens. This is how a camera is used

8 .

The diagram shows what type of lens?

Converging

Diverging

Convex

Complex

Convex lenses are called converging as they bring light rays to a point where they all meet (the rays converge). Concave lenses are called diverging lenses as they spread light rays out (diverge)

9 .

Some people have to wear glasses. Which of the following statements is correct for short sightedness?