A Thin Double-Convex Lens Is Intended to Focus the Image $83 \mathrm {~cm}$

question 63

Multiple Choice

A thin double-convex lens is intended to focus the image of an object onto a screen so that the image is life-sized on the screen. The lens has equal-magnitude radii of $83 \mathrm {~cm}$ and a refractive index of 1.6.
(a) What is the distance $d$ from the image to the screen?
(b) What is the total distance $L$ between the object and the image?

• A) (a) \(d = 69 \mathrm {~cm}\)
• (b) \(L = 35 \mathrm {~cm}\)
• B) (a) \(d = 138 \mathrm {~cm}\)
• (b) \(L = 276 \mathrm {~cm}\)
• C) (a) \(d = - 138 \mathrm {~cm}\)
• (b) \(L = - 276 \mathrm {~cm}\)
• D) \(( \mathrm { a } ) d = 276 \mathrm {~cm}\)
• (b) \(L = 552 \mathrm {~cm}\)

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