# 2384 model assume the lens is thin so we can solve

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23.84. Model: Assume the lens is thin so we can solve the thin-lens equation for . fs s s f ′ = Visualize: We are given 0.150 m and 10 m. f s = = We are also given d d 5.0 m s. s t = Refer to Problem 23.83 to learn about longitudinal magnification: 2 d d . M s s m = = − Solve: The speed of the image is d d . s t Use the chain rule. Then apply . m s s = − 2 2 2 2 d d d d d d d d d d d d d d d d fs s s s s s s s s f s s f M m t s t t t s t s t s f t = = = − = − = − = − ( ) 2 2 10 m 10 m d d 0.15 m 5.0 m s 1.16 mm s d d 10 m 0.15 m s s s f s t s f t = = = − = = − Assess: The negative answer indicates the image is moving toward the lens.
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• Winter '10
• E.Salik
• Light, refractive index, Total internal reflection, Geometrical optics

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