Lect28 - ! # "& " # ' % %( #" "# $...

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Unformatted text preview: ! # "& " # ' % %( #" "# $ %% % $ %% # % % # # " "& 1 S 1 S 1 f # )& M S S "& % ' % %( % % # # + , 1 S 1 S 1 f 1 # ! . , - M S S % 2 # % % % % ! #! ! ,! # $. # % # % % / / % 0 # 0 # #! ! ,! # $. # % # % / / % 0 # 0 # ' ( * # 4 5 % $ % %- + 6 % # $. # # 3 # 4 8 $. $ 9 9 $. : % 9 9 + 6 % # $. # # 7 A parallel laser beam of width w1 is incident on a two lens system as shown below. < 2 * Each lens is converging. The second lens has a larger focal length than the first (f2 > f1). What does the beam look like when it emerges from the second lens? A B A. The beam is converging B. The beam is diverging Cparallel to the axis with a width < w C. The beam is 1 D D. The beam is parallel to the axis with a width = w1 E E. The beam is parallel to the axis with a width > w1 = % # = 5 '# ( *= # " # '# ( % # # = "; # : > < A. 14 cm B. 28 cm 2 C. 56 cm A person with normal vision (near point 28 cm) is standing in front of a plane mirror. What is the closest distance to the mirror the person can stand and still see herself in focus? r i d 5 5 % # # # ? % $ 6 @ +: AB # = d D E % < % % % , C : E % D - % % % # = & < A. The farsighted person's glasses 2 B. The nearsighted person's glasses Two people who wear glasses are camping. One of them is nearsighted and the other is farsighted. Which person's glasses will be useful in starting a fire with the sun's rays? D < % A< % % % % F G + GH 9 9 5=5 % % $. % $ $ - =5 >& # # % # # # = 3> A>& #A3> 'G ( F G I F +H @ 5 '6 ( F G +: 8 F 5 '<( 8 +F 5 I G I F +H @ 5 ' ( 8 +F 5 I G +: 8 F 5 1 s 1 f 1 s s fs s f - F $ "# M s s , "& )& % % 5=5 % % $. % $ $ - =5 >& A # # % # # # = 3> A >& # A 3> ,A = 3* &' ( ) 'G ( A E = 3* '6 ( ( A J = 3* * * '<( A E&= 7> ' ( A J&= 7> ' ( AJ = > ! $ % ! ! " # # A E&= 7> F A J&= 7> + % $. ## # F G * 5=5 % % $. % $ $ - =5 >& A # # % # # # = 3> A>& #A3> ,A = 3* A &= 7> ! 'G ( F G I F +H @ 5 '6 ( F G +: 8 F 5 # '<( 8 +F 5 I G I F +H @ 5 % # &' ( ' ( 8 +F 5 I G +: 8 F 5 s2 fs2 s2 f - F , "& )& A % % "& % $ "# M2 s2 s2 F I 5 ,A = ;C A C= ; 3 - $. A >3 A>3 #A3> F I 5 ,! = 3* =C - ) 'G ( #, ) '6 ( ( ! # ,( '<( ,! = ;C = * + " + ' % % % % % ,# ( , - , 1 s1 1 f 1 s1 1 s1 s2 + , 1 s2 2m s1 1 f 1 s2 1 s2 7 ? - # ,A = 3 $. A 7 =G % &' ( ) 'G ( A E&= 3 '6 ( ( A J&= 3 * * '<( A E = 3 ' ( A7 # A 3> ,A = 3 A J = 3 ' ( AJ = 7 ! $ % ! ! " # # A E&= 3 F A J&= 3 + % ## 8 +F 5 I G $. # ; G % ? # $. ,A = 3 A 7 = A7 #A3> ,A = 3 A E&= 3 ! 'G ( F G I F +H @ 5 '6 ( F G +: 8 F 5 # '<( 8 +F 5 I G I F +H @ 5 % # &' ( ' ( 8 +F 5 I G +: 8 F 5 s2 fs2 s2 f - F , "& "& A % )& % $ )& M2 s2 s2 F I 5 , A &= 3 AE = > &) % % $ %% )# ! 8 $. 1 S 1 S 1 f M S S % # $. We could just as well take the rays to be going right to left. In that case the "image" shown above becomes a virtual object and the "object" shown above becomes a real image. "& # "& ; , )& ...
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This document was uploaded on 03/08/2012.

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