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CHApter 11

# CHApter 11 - Total Internal Reflection of Light – a...

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CHAPTER 11 Refraction - bending of light as it enters a different optical medium Laws of Refraction 1. The refracted ray bends toward the normal when travelling from air to water (less optically dense to more optically dense) 2. The refracted ray bends away from the normal when travelling from water to air (more optically dense to less optically dense) 3. More Optically dense – near normal, light goes slower 4. Less Optically dense – away from normal, light goes faster Index of Refraction – measure of the slowing of speed of light Absolute Index of Refraction – ratio of the speed of light in a vacuum to the speed of light in the other medium = n cv Relative Index of Refraction : n2n1 Snell’s Law: = n1sinθ1 n2sinθ2 Apparent Depth vs. Actual Depth: = d2 d1n2n1 Dispersion – a method of demonstrating that white light is composed of many different wavelengths (colors) of light. Light travels through a prism – 2 surfaces to go through causes the difference between the wavelengths of each color to become greater

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Unformatted text preview: Total Internal Reflection of Light – a phenomenon that occurs when light travels from a more optically dense to a less optically dense medium and the refracted angle is ° 90 and this causes the incident ray to be reflected back into the more dense medium =-θc sin 1n2n1 Eye Defects 1. Far sightedness (Hyperopia/presbyopia) – eyeball too short – converging lens fixes problem 2. Near sightedness (Myopia) – eyeball too long – diverging lens fixes problem 3. Astigmatism – out of round cornea or lens – cylinder fixes problem Convex Concave Object between F and 2F – Real, larger, inverted Object at 2F – Real, same size, inverted Object beyond 2F – real, smaller, inverted Object within F – virtual, larger, upright, behind object Virtual, upright, smaller Refractive Power in Diopters = = + P 1fdiopters 1do 1di If di is negative, then the image is virtual If magnification is negative, then the image is inverted...
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CHApter 11 - Total Internal Reflection of Light – a...

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