# The beam is parallel to the axis with a width w1 e

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Unformatted text preview: tem as shown below. Checkpoint 3 Each lens is converging. The second lens has a larger focal length than the first (f 2 > 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 C C. The beam is parallel to the axis with a width < w1 D E D. The beam is parallel to the axis with a width = w1 E. The beam is parallel to the axis with a width > w1 “Not sure about the width, but with larger f2 it seems width would be greater too :/” Physics 212 Lecture 28, Slide 10 Physics 212 Lecture 28, Slide A parallel laser beam of width w1 is incident on a two lens system as shown below. Checkpoint 3 Each lens is converging. The second lens has a larger focal length than the first (f 2 > 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 C C. The beam is parallel to the axis with a width < w1 D E D. The beam is parallel to the axis with a width = w1 E. The beam is parallel to the axis with a width > w1 1. 2. 3. Parallel rays are transmitted and pass through focal point (f1) Those rays also pass through focal point of second lens (f2) and therefore are transmitted parallel to the axis. f2 > f1 implies that the width > w1 Physics 212 Lecture 28, Slide 11 Physics 212 Lecture 28, Slide Multiple Lenses Exercises 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 . s 1 =7 0 c m f=4 7 c m What is the nature of the image from the first lens alone? (A) R EAL UP R IG HT (B) R EAL INVER T ED s > f M =− s′ = s ’ > 0 s′ s M < 0 (D) VIR T UAL INVER T ED PICTURES EQUATIONS 111 =− s′ f s (C ) VIR T UAL UP R IG HT fs s− f Dra w R a y s a s a b o ve re a l im a g e inve rte d im a g e P h y s ic s 2 1 2 Le c tu re 2 8 , S lid e 1 2 Multip le Le ns e s Exe rc is e s T wo c o nve rg ing le n s e s a re s e t u p a s s...
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