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

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) $L = 552 \mathrm {~cm}$

Correct Answer:

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