- 15 Two Thin Lenses Of Focal Lengths Fi 20 Cm And F2 60 Cm Are Placed In Contact A Find The Focal Length F Of Th 1 (30.52 KiB) Viewed 41 times
15. Two thin lenses of focal lengths fi = 20 cm and f2 = 60 cm are placed in contact. (a) Find the focal length f' of th
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15. Two thin lenses of focal lengths fi = 20 cm and f2 = 60 cm are placed in contact. (a) Find the focal length f' of th
15. Two thin lenses of focal lengths fi = 20 cm and f2 = 60 cm are placed in contact. (a) Find the focal length f' of the combined lenses system. (b) Find the focal length f3 of a third lens placed in contact with these two that would result in an overall focal length f" = -40 cm. [(a) f'=15.0 cm, (b) f3 = -10.9 cm]
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