Refraction Lab (Mr. Konichek). 10-15 º LAB: Refraction of Light—Part 1 Index of Refraction for H 2 O Procedure: Set laser at 10-15º & use clamp to hold.

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Presentation transcript:

Refraction Lab (Mr. Konichek)

10-15 º LAB: Refraction of Light—Part 1 Index of Refraction for H 2 O Procedure: Set laser at 10-15º & use clamp to hold down laser button ( UNCLAMP THE BUTTON WHEN FINISHED ) On vertical tape strip, mark un- refracted laser dot (Un) ( CAUTION : ONCE SET UP DON ’ T MOVE BEAKER !!) Fill beaker 2/3 full with H 2 O & mark water line 1 (WL 1) & refracted line 1 (Re 1) Add more H 2 O and mark WL 2 & Re 2 h = Re to WL & h’ = Un to WL Calculate n water = h/h’ for both trials & % error WL 2__ WL 1__ Un ● Re 1 ● Re 2 ●

LAB: Refraction of Light—Part 2 θ i = 33 ˚ θ r = 22.5˚ AirUnknown θ i = 22.5˚ θ r = 35˚ Unknown Index of Refraction n i sin θ i = n r sin θ r n r = n i sin θ i = sin33˚ = sin θ r sin 22.5˚ Unknown Index of Refraction n i sin θ i = n r sin θ r n i = n r sin θ r = sin32˚ = sin θ i sin 22.5˚ % Error Index of Refraction |1.51 – 1.46| x 100 = 3.31% 1.51 Average Index of Refraction (Experimental) ( )/2 = 1.46 Unknown = Plexiglas Speed of light in Unknown n = c/v s v s = c/n = 3 x 10 8 m/s = 2.05 x 10 8 m/s 1.46 NOTE: Use CLEAR not frosted sides and θ i at the 1 st interface & θ r at the 2 nd interface should be equal because both are air—If not you will need to do 2 Snell Law calculations and average the n’s!!!! Explanation: This sketch shows…

3b 1 2 3a 45 Procedure: As a group, trace the paths of the light rays through the different shapes Test the shapes for reversibility (does it follow the same path back?) Make summary table: shape, converging/diverging & reversibility L AB REPORT REQUIREMENTS : Follow lab report handout for guidelines (I do not need it typed though) Each part should have its own data table (or use data table provided) Include Lab handout with tape on it from Part 1 (or on a blank sheet of paper) Part 2 sketches: put your name, block material name, sketch description explanation, clearly labeled & diagramed & ALL calculations clearly shown: Vs, n’s & n ave & % error (each person does a different unknown) Part 3 Sketches: clearly diagramed & labeled & summary table One Part 1 & Part 3 & conclusion & summary per group – Part 2 each person LAB: Refraction of Light—Part 3