Topic 6 Lenses Flashcards

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1
Q

How do lenses form images

A

By refracting light

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2
Q

Convex lense

A

Bulges outwards
Causes rays of light parallel to the axis to be brought together (converge) at the principle focus

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3
Q

Concave lenses

A

Cave inwards
Causes parallel rays of light to spread out (diverge)

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4
Q

What is the axis of a lense

A

The line passing through the middle of the lens

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5
Q

What is the principle focus of a Convex lens

A

Where rays hitting the lens parallel to the axis all meet

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6
Q

What is the principle focus of a concave lens

A

The point where rays parallel to the axis appear to come from and can race them back until the appear to meet up

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7
Q

What is the focal length

A

Distance from centre of lens to principle focus

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8
Q

3 rules for convex lenses

A

And incident ray parallel to the axis refracts through the lens and passes through the principal focus on the other side
an incident ray passing through the principal focus refracts through the lens and travels parallel to the axis
an incident passing through the centre of the lens carries on in the same direction

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9
Q

3 rules for concave lens

A

An incident ray parallel to the axis refracts through the lens and travels in a line with the principal focus
an incident ray passing through the lens towards the principle focus refracts through the lens and travels parallel to the axis
An incident ray passing through the centre of a lens carries on in the same direction

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