1. The distance between an object and its image formed by a diverging lens is 5.
ID: 1791265 • Letter: 1
Question
1. The distance between an object and its image formed by a diverging lens is 5.90 cm. The focal length of the lens is -3.00 cm. Find (a) the image distance and (b) the object distance.
2. A farsighted woman breaks her current eyeglasses and is using an old pair whose refractive power is 1.610 diopters. Since these eyeglasses do not completely correct her vision, she must hold a newspaper 42.00 cm from her eyes in order to read it. She wears the eyeglasses 2.00 cm from her eyes. How far is her near point from her eyes? N=?
Explanation / Answer
here,
1)
let the image distance an dthe object distance be di and do
using the lens formula
1/f =1/di + 1/do
- 1/3 = 1/di +1/do ...(1)
and
do + di = 5.9 cm ....(2)
from (1) and (2)
di = - 2.19 cm
do = 8.09 cm
the object distance is 8.09 cm
the image distance is -2.19 cm
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