How Lenses Work

This lesson covers:

  1. How lenses focus and disperse light via refraction
  2. How the power of a lens changes with curvature
  3. The difference between real and virtual images
Diagram showing a concave lens labeled A and a convex lens labeled B.

Which of the below statements about the lenses above is correct? 

A is a convex lens and B is concave lens 

B is a convex lens and A is concave lens 

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Another name for a convex lens is a:

Converging lens

Diverging lens

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The distance between the principle focus and the centre of the lens is called the 'f l'.

ocal
ength

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Illustration of a microscope showing various components such as the eyepiece, objective lenses, and stage.

Higher power lenses are:

(Select all that apply)

More curved

Made of a material which refracts light less strongly

Less curved

Made of a material which refracts light more strongly

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What type of image is being described by the statement below:


'Light rays come together to form an image.

The image can be captured on a screen.'

Real image

Virtual image

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Diagram showing a concave lens with light rays diverging and forming a virtual, upright, and smaller image of a walrus.

Compared to the object, please state whether the image is:


'real' or 'virtual': 

'upright' or 'inverted':

'bigger' or 'smaller':

virtual
upright
smaller

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What type of image is being described by the statement below:


'Light rays don't come together where the image appears to be.

The image cannot be captured on a screen'

Virtual image

Real image

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