A lens forms an image by refracting light, each section of the lens acts like a prism, each section refracting light as it goes into the lens and again when it comes out
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What happens in a convex lens?
In a convex lens, parallel rays of light are brought to focus at the principal focus. A convex lens is also called a converging lens.
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What is the focal length?
The focal length is the distance from the lens to the principal focus
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What is the focal length determined by?
Refractive Index of the material from which the lens is made, the curvature of the lens's two surfaces
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What is the relationship between refractive index and flatness of the lens, for a given focal length?
The greater the refractive index, the flatter the lens, meaning the lens can also be manufactured thinner
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What happens in a concave lens?
In a concave lens, parallel rays of light diverge as if coming from the principal focus, a concave lens can also be called a diverging lens
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How is the nature of an image determined?
By its size relative to the object, Whether it is upright or inverted relate to the object and whether it is real or virtual
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How can magnification be calculated?
Magnification = Image Height ÷ Object Height
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What is the relationship between power of a lens and its focal length?
Power = 1 ÷ Focal Length
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What is he near and far point of human vision?
The near point is around 25cm and the far point is infinity
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Other cards in this set
Card 2
Front
What happens in a convex lens?
Back
In a convex lens, parallel rays of light are brought to focus at the principal focus. A convex lens is also called a converging lens.
Card 3
Front
What is the focal length?
Back
Card 4
Front
What is the focal length determined by?
Back
Card 5
Front
What is the relationship between refractive index and flatness of the lens, for a given focal length?
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