a shaped transparent piece of plastic or glass that refracts light
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why does light refract?
changes direction due to change in density as it enters a denser medium.
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what happens to light when it enters a convex lens?
as a convex lens is thicker in the middle than edges, parallel light rays that enter converge, coming together at point called the principal focus.
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what happens to light when it enters a concave lens?
as concave lenses are thinner in the middle than at the edges, parallel rays diverge, they separate, but appear to form a principal focus on the other side of the lens.
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in what ways can images from a lens be described?
images from a lens can be either: inverted or upright, real or virtual, magnified or diminished.
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what is the difference between a real and virtual i
image?
a real image can be projected onto a screen, whereas a virtual image appears to come from behind the lens.
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how do images appear from the following examples of convex lenses:
.camera/human eye
.projectors
.magnifying glasses
.camera/human eye = inverted, diminished, real
.projector = inverted, magnified, real
.magnifying glasses = upright, magnified, virtual
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how do images from concave lenses always appear?
upright , diminished , virtual
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what is the calculation for magnification?
magnification = image height ÷ object height
(magnification has no units.)
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in what order is the visible light range spectrum?
in order of increasing frequency and decreasing wave length: red, orange, yellow, green, blue, indigo, violet.
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what can happen to light at the boundary between two different materials?
it can be either absorbed of transmitted.
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what happens during the absorption of light at the boundary between two different materials?
When waves are absorbed by a surface, the energy of the wave is transferred to the particles in the surface. This will usually increase the internal energy of the particles. When white light shines on an opaque object, some wavelengths or colours of light
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what happens during the transmission of light at the boundary between two different materials?
When waves are transmitted, the wave continues through the material. Air, glass and water are common materials that are very good at transmitting light. They are transparent because light is transmitted with very little absorption. Translucent materials t
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what happens when light is transmitted through a coloured filter?
When white light passes through a coloured filter, all colours are absorbed except for the colour of the filter. An object appears to be black if it absorbs all the wavelengths of visible light. This is because the red light contains no blue light for the
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Other cards in this set
Card 2
Front
why does light refract?
Back
changes direction due to change in density as it enters a denser medium.
Card 3
Front
what happens to light when it enters a convex lens?
Back
Card 4
Front
what happens to light when it enters a concave lens?
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