lect5419 - 1 In a refracting telescope parallel light is...

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1. In a refracting telescope, parallel light is collected from a distant source to form a real image that is then magnified by the eyepiece. To achieve high magnification, this real image in located near the eyepiece’s focal point. Use this information to determine how the length of a refracting telescope compares with the focal lengths of the lenses. 2. Sometimes when a person develops a cataract, the lens of the eye is surgically removed and replaced with a plastic one. Would you expect this lens to be converging or diverging one? Explain.
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The Wave Nature of Light
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Waves vs Particles
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Huygens’ Principle Every point on a wave front can be considered as a source of tiny wavelets that spread out in the forward direction at the speed of the wave itself. The new wave front is the envelope of all wavelets – the tangent to all of them.
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The bending of waves behind the obstacles into the “shadow region” is known as diffraction .
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Huygens’ Principle and the Law of Refraction
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Light travels from one medium to another: What will be changed – wavelength or frequency?
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