# college physics

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A certain person's eye measures 24.0 mm from the pupil to retina.
(a) If we treat the eye's lens as a thin lens, what is its focal length when the person focuses on a pencil 44.3 cm from the eye?
(b) While the person focuses on the pencil, what is the image distance for a wall 426 cm from the eye?

• college physics -

(1) 1/2.4 + 1/44.3 = 1/f

Solve for for in cm.

(2) Using the same f that you get in (1), solve
1/x + 1/426 = 1/f
to get the value of the wall image distance, x.
It will be in centimeters.

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