Lenses

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Last updated 5:44 PM on 6/3/26
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9 Terms

1
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What do lenses do?

Refract light

2
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What is a convex lens?

A convex lens is thicker in the middle than at the edges and converges parallel light rays to a focal point.

3
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What is a concave lens?

A concave lens is thinner in the middle than at the edges and diverges parallel light rays.

4
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What is the principal focus of a lens?

The point where parallel rays converge after passing through a convex lens.

5
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What is focal length?

The distance from the centre of a lens to its principal focus.

6
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What is lens power?

A measure of how strongly a lens converges or diverges light.

P=1/f

  • P = power (D)

  • f = focal length (m)

7
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What is a real image?

An image formed where light rays actually meet.

  • Can be projected onto a screen

  • Usually inverted

8
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What is a virtual image?

An image formed where light rays only appear to come from.

  • Cannot be projected onto a screen

  • Usually upright

9
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PRACTICE LENS DIAGRAMS!!!!!!!!!!