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Today 2/10

Today 2/10. Multiple Lens Systems 26.9 Lab: Questions? No HW assigned today Review in class tomorrow HW: “2/10 Two Lenses” Due Thursday 2/13 Exam I Thursday, Feb 13 5:00 to 7:00pm Witmer 116 Overflow to Witmer 114. Example: f = + 6 cm and - 18 cm lenses are 1 cm apart d o = + 12 cm.

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Today 2/10

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  1. Today 2/10 • Multiple Lens Systems 26.9 • Lab: Questions? • No HW assigned today • Review in class tomorrow • HW: “2/10 Two Lenses” Due Thursday 2/13 • Exam I Thursday, Feb 13 5:00 to 7:00pm Witmer 116Overflow to Witmer 114

  2. Example: f = + 6 cm and - 18 cm lenses are 1 cm apart do = + 12 cm Find the image due to the first lens, ignore the second for now. do Need another ray-- from the center of the diverging lens along the first image. Now ask what happens to these rays at the second lens. do

  3. do di di Example: f = + 6 cm and - 18 cm lenses are 1 cm apart do = + 12 cm Math First lens do = 12, f = 6 di = ? di = 12 Second lens do = -11, f = -18 di = ? di = 28.3 What about Magnification? Total m = -1(2.6) = -2.6 First image m1 = -12/12 = -1 Second image m2 = -28.3/-11 = 2.6 Inverted and real do

  4. do di di Example: f = + 6 cm and - 18 cm lenses are 1 cm apart do = + 12 cm Math First lens do = 9, f = 6 di = ? di = 18 First image m1 = -18/9 = -2 Second lens do = -9, f = -18 di = ? di = 18 Total m = -2(2) = -4 Second image m2 = -18/-9 = +2 Inverted and real do

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