Grade 11 - 3rd Trimester - 06 - Optics 2.pptx

# Grade 11 - 3rd Trimester - 06 - Optics 2.pptx - O PTICS...

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O PTICS Refraction of Light

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REFRACTIO N Recall: -Bending of light due to a change in speed -Light changes direction as it passes from one medium to another

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LENS -Transparent object that can bend light rays Two kinds of lenses: 1. Convex Lens 2. Concave Lens
CO NVEX LENS -Converging lens -Thicker at the middle than at the edges

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CO NCAVE LENS -Diverging lens -Thicker at the edges

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LENS TERMINOLOGIES 1. OPTICAL CENTER, O the center of the lens 2. PRINCIPAL AXIS, P the line joining the centers of curvature and passes through O 3. SECONDARY RAY, S ray passing through O but not parallel to P 4. FOCAL LENGTH, f distance between the focus and the O

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SPHERICAL LENSES
IM AG E FO RM ATIO N: CO NVEX LENS

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IM AG E FO RM ATIO N: STEPS 1. Draw a horizontal line to represent the principal axis, and then draw a lens. Mark the optical center in the lens. 2. Mark the location of F and 2F on both sides of the lens. 3. Draw a vertical line representing an object on a specific location.
IM AG E FO RM ATIO N: RULES 1. A ray parallel to the principal axis is

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