# P3.1- Lenses Part 1

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Refraction is
the change of direction of light as it passes from one medium to another
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The refractive index is
how much a substance can refract a ray of light
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And you work that out by...
sin i / sin r
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The light rays in optical fibres are
constantly internally reflected
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Why?
because it is at an angle greater than the critical one
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A use of optical fibres:
endoscopes- they are flexible rods that are used to see inside the body directly
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The critical angle is
the angle of incidence of a light ray in a transparent substance that produces refraction along the boundary
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And you work that out by..
n = 1/sin c so sin c= 1/ n
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Lenses are
optical devices that bend light by refraction
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A converging lens is also known as
a convex lens, the light rays come together
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A diverging lens is also known as
a concave lens, the light rays spread apart
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The power of a lens is measured in
dioptres
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And the equation is
1/ focal length (m)
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A real image can be
projected onto a screen
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A virtual image can
not be projected onto a screen
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Magnified means the image is
bigger
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Diminished means it's
smaller
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Inverted means it's
upside down
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## Other cards in this set

### Card 2

#### Front

The refractive index is

#### Back

how much a substance can refract a ray of light

### Card 3

#### Front

And you work that out by...

### Card 4

#### Front

The light rays in optical fibres are

Why?

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