Question

(a) Draw a ray diagram for the formation of image by a compound microscope.
(b) You are given the following three lenses. Which two lenses will you use as an eyepiece and as an objective to constuct a compound microscope?
$\begin{array}{ccc}\text{Lenses}& \text{Power (D)}& \text{Aperture(cm)}\\ {\text{L}}_1& 3& 8\\ {\text{L}}_2& 6& 1\\ {\text{L}}_3& 10& 1\end{array}$
(c) Define resolving power of a microscope and write one factor on which it depends.

Answer 1

(a)

(b) Objective lens $\to L_3$
Eye lens $\to L_2$
(c) The resolving power of a microscope is its ability to form distinctly separate images of two neighbouring objects.
$R.P=\frac{2\mu sin\theta }{\lambda }$
Thus, it depends on the wavelength $\left(\lambda \right)$.