Answer to Question #287401 in Optics for saf

Question #287401

A lens system is composed of two lenses. Lens A has a refractive power of +9.25 D and lens B has a refractive power of −3.75 D. An object is located 235 mm in front of Lens A. The focused image of the lens system is located exactly 30 cm behind Lens B. The lenses are suspended in air. Calculate the distance between the two lenses.

1
Expert's answer
2022-01-14T09:46:50-0500

"F=\\frac{fd}{f-d}=0.092~m,"

"\\frac 1F=\\frac1{F_1}+\\frac 1{F_2}-\\frac l{F_1F_2},"

"l=F_1+F_2-\\frac{F_1F_2}F=15.4~cm."


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