Chapter 34, Problem 108E

(a)

To determine

The position of the object to be placed to achieve the closest point at which the viewer can bring an object into focus and give the answer in terms of the magnifier focal length $f$.

(b)

To determine

The angle ${\theta }^{\text{'}}$ by an object of height $y$ subtend at the position found in $\frac{f\left(25\text{ cm}\right)}{f+25\text{ cm}}$.

(c)

To determine

The angular magnification $M$ with the object at $\frac{f\left(25\text{ cm}\right)}{f+25\text{ cm}}$.

(d)

To determine

The value of $M$ with an object at the position found in The angular magnification $M$ is $\frac{f+25\text{ cm}}{f}$ and compare $M$ with when the image is formed at infinity.

(e)

To determine

The advantages are gained by having the image formed by the objective just inside $F_1{}^{\text{'}}$ and what happens if the image is formed by the objective is just outside $F_1{}^{\text{'}}$.