# 50cm 50cm whatisthesmallestnumberonthe

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Unformatted text preview: 50 cm What is the smallest number on the ruler that you can see? 0 20 40 60 80 100 If you shine a laser into the tank at an angle of 45o, what is the refracted angle θR in the water ? A) θR = 28.3o Snell’s Law: B) θR = 32.1o C) θR = 38.7o nairsin(45) = nwatersin(θR) sin(θR) = nairsin(45)/nwater = 0.532 θR = sin­1(0.532) = 32.1o BB Exercise 45o A meter stick lies at the bottom of a rectangular water tank of height 50cm. You look into the tank at an angle of 45o relative to vertical along a line that skims the top edge of the tank. 50 cm 50 cm What is the smallest number on the ruler that you can see? nwater = 1.33 θR 0 d 20 40 60 80 100 θR = 32.1o What number on the ruler does the laser beam hit ? A) 31.4 cm B) 37.6 cm C) 44.1 cm tan(θR) = d/50 d = tan(32.1) x 50cm = 31.4cm BB Follow­Up 45o A meter stick lies at the bottom of a rectangular water tank of height 50cm. You look into the tank at an angle of 45o relative to vertical along a line that skims the top edge of the tank. 50 cm 50 cm nwater = 1.33 0 20 40 60 80 100 If the tank were half full of water, what number would the laser hit? (When full, it hit at 31.4 cm) A) 25 cm B) 31.4 cm C) 32.0 cm D) 40.7 cm E) 44.2 cm BB 45o 50 cm 50 cm 45o nwater = 1.33 θR 50 cm d = 50 cm d = 31.4 cm 0 20 θR = 32.1o 40 60 80 100 0 20 40 45o 50 cm nwater = 1.33 θR 0 20 d = 40.7 cm 40 25 cm + (31.4/2) cm 60 80 100 60 80 100 More Practice More Practice A monochromatic ray enters a slab with n1 = 1.5 at an angle θb as shown θb TOP n = 1 n1 = 1.5 BOTTOM (A) θb n = 1 BB Total...
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## This document was uploaded on 02/13/2014.

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