## **Core Concept**
The electron microscope is a type of microscope that uses a beam of electrons to produce an image of the specimen. It is capable of much higher magnification and resolution than a light microscope, allowing scientists to see objects that are too small to be seen with a light microscope. The development of the electron microscope is attributed to a single key figure.

## **Why the Correct Answer is Right**
Ernst Ruska, a German engineer, is credited with the invention of the first electron microscope in 1933. He, along with his brother Helmut Ruska, developed the first practical electron microscope, which was significantly more powerful than any previous microscope. Their invention utilized a magnetic lens to focus the electron beam onto the specimen, producing high-resolution images.

## **Why Each Wrong Option is Incorrect**
- **Option A:** Although not provided, any incorrect option would not be associated with the development or invention of the electron microscope.
- **Option B:** Similarly, without specifics, any other incorrect choice would not have contributed to the foundational development of electron microscopy.
- **Option D:** This too would represent an incorrect attribution, with the actual founder being Ernst Ruska.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that the electron microscope has been pivotal in various scientific discoveries, especially in the fields of virology and materials science, due to its high resolution. Ernst Ruska's invention was recognized with the Nobel Prize in Physics in 1986.

## **Correct Answer:** C. Ernst Ruska