What 2 names are used for the type of lens in the image above?

Convex lens or converging lens.

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What 2 names are used for the type of lens in the image above?

Concave lens or diverging lens.

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What happens to light waves as they pass through a lens?

They are refracted (change direction).

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What is the focal length of a lens?

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

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What are 2 differences between high and low power lenses?

  1. High powered lenses are more curved.
  2. High powered lenses are made from a material that refracts light more strongly.

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When describing an image, which 3 properties should you mention?

Whether the image is:


  1. 'real' or 'virtual'.
  2. 'upright' or 'inverted'.
  3. 'bigger' or 'smaller' than the object.

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How can you tell the difference between a real and virtual image?

A real image is formed where light rays come together, and can be captured on a screen. 

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What type of image(s) can be produced by convex lenses?


Real, virtual, or either?

Convex lenses can produce either real or virtual images.

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What type of image(s) can be produced by concave lenses:


real, virtual, or either?

The image produced by a concave lens is always virtual.

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