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Equation Sheet

through space and materials the direction of the

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Unformatted text preview: el addition of resistors: 1/Req = 1/R1 + 1/R2 + … resistance R = ! Resistive model of the body: L A Electromagnetic waves: coupled mutually perpendicular E ­ and B ­fields that propagate !! through space and materials. The “direction” of the power or intensity is E ! B . The magnitude of the average (or rms) intensity is I = ½cε0E2peak (Watts per m2). c = 3×108 m/s ε0 = 8.85×10 ­12 (mks units) c = λf E = cB Polarization: intensity of original polarized light transmitted through a polarizer at angle θ is I = I0cos2θ. If the original light is unpolarized, I = ½I0 through one polarizer. 1 1 ­D Kinematic equations: y = y0 + v0t + at 2 2 v = v0 + at v 2 = v 2 + 2 a( y ! y0 ) 0 g = 9.8 m/s2 Law of Reflection θreflected = θincident Mirror and Lens Equation and magnification: 111 d + = M = ! i Power = 1/f d o di f do Convex mirror: f –, do+, di+ (same side as do), di– (opposite side of do) Concave mirror: f +, do+, di+ (same side as do), di– (opposite side of do) Convex lens: f +, do+, di+ (opposite side of do), di– (same side as do) Concave lens: f –, do+, di+ (opposite side of do), di– (same side as do) Near point: NP is the closest an object can be in front of the eye and focus an image on the retina Far point: FP is the farthest an object can be in front of the eye and focus an image on the retina Magnifier magnification: M= NP fmagnifier Magnification of a compound microscope: M = M obj M eyepiece = ! di NP do NP =! fobj feyepiece do ! fobj feyepiece...
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