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4 Cards in this Set
- Front
- Back
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How does light get refracted?
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When it enters a more dense medium (e.g. air to glass) light moves towards the normal, this is because the light waves have slowed down. Therefore the angle of refraction (r) is smaller than the angle of incidence (i). It is the opposite entering a less dense medium.
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What happens when you shine white light through a prism.
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The light ray is split into the colours of the spectrum, this is called dispersion.
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What is total internal reflection?
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When the i = p. This happens because the angle of incidence is higher than the critical angle.
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How does the endoscope work?
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It contains two bundles of optical fibres alongside each other. One is used to shine light into the cavity and the other sees the internal surfaces of the cavity. A lens over the second bundle is used to form an image.
Laser light may be used as a source of energy in an endoscope. It can cut away or destroy damaged tissue and cauterise leaking blood vessels. |
