Question

Microscope-I : It has a high resolution of $0.25A$ and can be used to observe very small organelles like ribosomes.
Microscope-II : It is used to observe various stained specimens but does not resolve very small specimens, such as viruses.
Select the correct option for the scientists who discovered the microscopes-I and II.
$\begin{array}{cc}\text{Microscope-I}& \text{Microscope-II}\\ \text{(i) Zernike}& \text{Edward Jenner}\\ \text{(ii) Knoll and Ruska}& \text{Rudolf Virchow}\\ \text{(iii) Z. Janssen}& \text{Zernike}\\ \text{(iv) Knoll and Ruska}& \text{Z. Janssen}\end{array}$

• A. (iv)
• B. (ii)
• C. (iii)
• D. (i)

Answer 1

The correct option is A (iv)

According to the description given, Microscope-I is an electron microscope and Microscope-II is a compound microscope.

The first electron microscope was developed by M. Knoll and E. Ruska in 1931.
Compound microscope was invented by Zacharias Janssen in the 16th century.

Frits Zernike invented the phase-contrast microscope that allowed for the study of colorless and transparent biological materials.

Edward Jenner & Rudolf Virchow were not involved in discovery of any type of microscope.