Microscopes and Medical Imaging Practice Quiz (8 questions)

Explanation

A phase-contrast microscope is a light microscope designed to enhance contrast in living, unstained cells. An electron microscope is not suitable for observing living specimens under these conditions.

Explanation

A light microscope uses visible light and glass lenses, with light passing through the specimen to produce a magnified image. Electron microscopes instead use electron beams and electromagnetic lenses, making that description inappropriate here.

Explanation

Total magnification is calculated by multiplying the ocular and objective magnifications, so $10\times 40 = 400\times$. Adding the two values would give $50\times$, which is not the magnification rule for a compound microscope.

Explanation

Magnification equals drawing size divided by actual size, so $M=\frac{6}{0.03}=200\times$. Dividing actual size by drawing size would produce the reciprocal rather than the required magnification.

Explanation

A light microscope uses light and glass lenses to magnify objects, allowing the observation of living or preserved specimens. Electron microscopes, in contrast, use electrons, not light.

Explanation

Light microscopes can magnify objects up to approximately 1500 times. Electron microscopes are required for magnifications beyond this, such as over 100,000 times.

Explanation

An electron microscope is used to magnify specimens more than 100,000 times and produce detailed images by detecting electrons. It is not suitable for viewing living specimens or producing 3D images with light, which are functions of other types of microscopes.

Explanation

The electron microscope was developed in the 1930s, enabling magnifications greater than 100,000 times. This technological advancement significantly improved the ability to study ultrastructures at a microscopic level.