Lect28

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Unformatted text preview: h o wn . T h e fo c a l le n g th o f e a c h le ns is 4 7 c m . T h e o b je c t is a lig h t b u lb lo c a te d 7 0 c m in fro n t o f th e firs t le n s . Le ns s e p a ra tio n = 2 m What is the object distance s2 for lens 2? (A) s 1 = 7 0 c m f = 4 7 c m s 1 ’ = 1 .4 3 m s 2 = ­1 .4 3 m (B) s 2 = +1 .4 3 m (C ) s 2 = ­0 .5 7 m (D) s 2 = +0 .5 7 m (E) s 2 = +2 .7 m THE OBJECT FOR THE SECOND LENS IS THE IMAGE OF THE FIRST LENS s 2 = ­0 .5 7 OR s 2 = +0 .5 7 Im a g e o f firs t le ns is a R EAL o b je c t fo r th e s e c o nd le ns P h y s ic s 2 1 2 Le c tu re 2 8 , S lid e 1 3 Multip le Le ns e s Exe rc is e s T wo c o nve rg in g le n s e s a re s e t u p a s s h o wn . T h e fo c a l le ng th o f e a c h le ns is 4 7 c m . T h e o b je c t is a lig h t b u lb lo c a te d 7 0 c m in fro nt o f th e firs t le ns . Le ns s e p a ra tio n = 2 m s 1 =7 0 c m f=4 7 c m s 1 ’ = 1 .4 3 m s 2 = 0 .5 7 m What is the nature of the FINAL image in terms of the ORIGINAL object? (A) R EAL UP R IG HT (B) R EAL INVER T ED fs2 s2 − f s 2 > f M2 = − s2′ s2 (D) VIR T UAL INVER T ED PICTURES EQUATIONS s2′ = (C ) VIR T UAL UP R IG HT Dra w R a y s a s a b o ve s 2 ’ > 0 re a l im a g e R ES ULT S s 2 ’ = 2 .6 9 m M2 < 0 M = M1 M2 > 0 M = 9 .6 up rig h t im a g e P h y s ic s 2 1 2 Le c tu re 2 8 , S lid e 1 4 Multip le Le ns e s Exe rc is e s S up p o s e we inc re a s e th e in itia l o b je c t d is ta n c e to 7 4 c m Le ns s e p a ra tio n = 2 m s 1 =7 4 c m f=4 7 c m How does the L, the distance to the FINAL image, change? (A) L inc re a s e s (B) L d e c re a s e s R ES ULT S s 1 ’ : 1 .4 3 m 1 .2 9 m s 2 ’ : 2 .6 9 m 1 .3 8 m (C ) L re m a ins th e s a m e Step through images, one at a time WORDS Inc re a s ing s 1 will d e c re a s e s 1 ’ (m o ving c lo s e r to fo c a l p o int wo uld inc re a s e th e im a g e d is ta nc e ) De c re a s ing s 1 ’ will inc re a s e s 2 Inc re a s ing s 2 will d e c re a s e s 2 ’ EQUATIONS 111 =− s1′ f s1 s2...
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This note was uploaded on 02/18/2013 for the course PHYS 212 taught by Professor Kim during the Fall '08 term at University of Illinois, Urbana Champaign.

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