Lenses Flashcards

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1
Q

Describe a convex lens

A

Thicker at the centre than the edges

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2
Q

Describe a parallel ray of light passing through a convex lens

A
  • central ray passes through lens without being refracted
    = ray is passing directly along the normal
  • all other rays refract and are focused on a point (principle focus)
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3
Q

Define a focal lens

A

Distance from the lens to the principal focus

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4
Q

Describe a concave lens

A

Thicker at the edges than the centre

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5
Q

Effects of concave lens

A

Make light rays spread out
= light rays diverge

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