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Exam 2 key

# The lenses are separated by 30 cm and each has a

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Unformatted text preview: ion on the scantron blank; show your work below. R = 310Ω + 30Ω + 290Ω /2 = 485Ω (hard!) or R = (110V)/(227mA) = 485Ω (easy!) 2 Vrms = I rms R + 1 / ! C 2 2 2 #V & # 110V & 2 2 " 1 / ! C = % rms ( ) R 2 = % ( ) 485 = 974775* \$ .100 A ' \$ I rms ' 2 2 2 C= 1 1 = = 2.69 µ F 2 2 ! " 974775# (2\$ " 60 Hz ) " 974775#2 2 16 (8 points). Uncle Albert has a far point (FP) of 1.8 m and a near point (NP) of 30 cm. What is the dynamic range of his eyes? In other words, when he looks at something located at the FP and then looks at something at the NP, through how many diopters do his eyes’ lenses have to change in order to see each clearly? Leave this question on the scantron blank; show your work below. 1 1 1 1 1 1 + = = PFP + = = PNP FP dretina fFP NP dretina fNP 1 1 1 1 Subtract these two equations: ! = PFP ! PNP = ! = !2.8 Diopters FP NP 1.8 0.30 Note:...
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