A real image is where the light comes together to form an image on a 'screen'.
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Define a virtual image.
A virtual image is when the rays are diverging (going in a different direction), therefore the light from the object appears to be coming from a completely different place.
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What type of lens do you need if you're short-sighted?
Concave
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When you look in a mirror are you seeing a real or virtual image.
Virtual image.
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When looking through a magnifying lens is the image real or virtual?
Real image.
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All lenses do what?
All lenses change the direction of light rays by refraction.
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What type of lens do you need if you're long-sighted?
Convex
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An incident ray parallel to the axis will pass through the focal point when it's...what?
Reflected.
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What do convex lenses do?
Convex lenses is a converging lens - it bulges outwards. It causes parallel rays of light to converge (move together) to a focus.
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Define axis
The axis of a lens is a line passing through the middle of the lens.
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Define focal point
The focal point is where rays hitting the lens parallel to the axis all meet.
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Define focal length
Focal length is the distance from the lens to its focal point.
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A refracting telescope uses how many converging lenses?
Two.
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An incident ray passing through the focal point will be parallel to the axis when it's...what?
Reflected.
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Where are converging lenses used?
In optical telescopes.
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A refracting telescope is made up of what?
An objective lens and an eyepiece lens.
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Name another way of describing a retina.
The 'screen'
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Describe concave mirrors.
Concave mirrors are shiny on the inside of the curve.
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A reflecting telescope uses...
Concave mirrors and a converging lens.
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Other cards in this set
Card 2
Front
Define a virtual image.
Back
A virtual image is when the rays are diverging (going in a different direction), therefore the light from the object appears to be coming from a completely different place.
Card 3
Front
What type of lens do you need if you're short-sighted?
Back
Card 4
Front
When you look in a mirror are you seeing a real or virtual image.
Back
Card 5
Front
When looking through a magnifying lens is the image real or virtual?
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