Concept explainers
A person struggles to read by holding a book at arm’s length, a distance of 52 cm away. What power of reading glasses should be prescribed for her, assuming they will be placed 2.0 cm from the eye and she wants to read at the “normal" near point of 25 cm?
The power of the reading glasses
Answer to Problem 10P
Solution:
The power of the reading glasses are .
Explanation of Solution
Given:
Distance the person wants to read,
Normal near point,
Distance of glass from the eye,
Formula used:
The power of the reading glasses is calculated as
Here,
is the distance of the object
is the distance of image
Calculation:
Distance the person wants to read, , here negative sign indicates that the image form in the opposite direction of the lens.
The distance of the object from the eyes is
The power of the reading glasses is calculated as
Chapter 25 Solutions
Physics: Principles with Applications
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