Lab Practical

The maximum useful magnification for a light microscope is typically around 1000x. Going beyond this limit may result in distortion or loss of image clarity.

In a compound light microscope, the ocular lens is located in the eyepiece while the objective lens is placed close to the specimen to magnify and focus the image.

Dyes are added to biological specimens to increase contrast, making it easier to distinguish different parts of the specimen under a microscope.

When observing living samples like the surface of a finger, a Scanning Electron Microscope (SEM) is more commonly used due to its ability to provide detailed surface images at high magnification without damaging the sample. Transmission Electron Microscope (TEM) is better suited for thin sections of samples. Compound Light Microscope has limitations in magnification and resolution for surface details. Atomic Force Microscope is more suitable for imaging nanoscale features on surfaces rather than larger structures like a finger's surface.

A compound light microscope is the most suitable for observing biological samples due to its ability to transmit light through the specimen, making it ideal for viewing thin sections with high amounts of detail. Scanning Electron Microscopes, Transmission Electron Microscopes, and Atomic Force Microscopes are not commonly used for observing dyed biological samples due to their different modes of imaging.

A Scanning Electron Microscope (SEM) is typically used to observe samples coated with a thin layer of conductive material, such as gold, to enhance imaging capabilities. This allows for detailed examination of the surface of samples at high magnifications.

A compound light microscope is preferred for observing unstained biological samples due to its ability to provide clear and detailed images without altering the natural state of the specimen.

When observing a heavy-metal-stained very thin section of a finger, a Transmition Electron Microscope (TEM) is used because it is capable of producing high-resolution images of ultra-thin samples by transmitting electrons through the specimen.

The Scanning Electron Microscope is the correct instrument for the given scenario as it uses a beam of electrons to scan the surface of a sample and produces a detailed image of the surface structure. The other options do not function in the same way as described in the question.

The Transmission Electron Microscope utilizes electrons in a vacuum and magnetic lenses for high-resolution imaging, unlike the Optical Microscope which uses light and glass lenses. The Scanning Electron Microscope and Atomic Force Microscope are different types of microscopy techniques that do not rely on electron transmission in a vacuum for imaging.

The Phase-Contrast and Nomarski Process are specialized microscopy techniques designed to enhance the contrast in samples with low contrast, particularly living specimens. Brightfield, Fluorescence, and Confocal microscopy are other types of microscopy techniques that do not specifically focus on converting phase differences to contrast.

When using a compound light microscope, it is important to follow the correct steps to ensure proper care and functionality. The correct answer details the four necessary steps for handling the microscope appropriately.

Magnification refers to the increase in apparent size of an object image. Resolution relates to the clarity and detail of an image, distortion is the alteration of an object's shape, and refraction is the bending of light as it passes through different mediums.

The term 'Resolving Power' specifically refers to the ability of an optical system to separate or distinguish fine details of an object being observed.

A lens focuses radiation from an objective to create an image, whereas a mirror reflects light, a filter changes the quality of light, and a prism refracts light.

Contrast refers to the difference in luminance or color that makes an object distinguishable. Brightness is the overall lightness or darkness of an image, saturation is the intensity of color, and sharpness refers to the clarity and focus of details.

When storing a microscope, it is important to follow specific steps to ensure its safety and longevity. The correct answer outlines the proper procedure for storing a microscope, including removing the last slide, rotating the nosepiece to low power, bringing the stage down, folding and tying the cord neatly, and returning it to the cabinet. The incorrect answers provided do not align with the best practices for storing a microscope.

The correct answer lists the objectives with their respective powers and colors. The incorrect answers provided variations in the specified powers, colors, or both, making them inaccurate choices.

Parfocal refers to the ability of a microscope or camera lens to remain in focus when rotating to a different objective, while the incorrect answers do not accurately describe this concept.

Parcentral is the correct term for this characteristic of microscope objectives, where the center of the field view remains consistent. Parfocal refers to objectives that remain in focus when switching between them, Paraxial refers to rays that are close to the optical axis, and Pericentral is not a commonly used term in microscopy.

The circle of light seen when looking into a microscope is known as the Field of View, which refers to the area visible through the lens of the microscope.

The working distance in microscopy refers to the distance between the objective lens and the slide. It is an important factor to consider when focusing and obtaining clear images.

An experiment is designed to test predictions for each hypothesis by collecting data and analyzing results to determine if the predictions hold true. This helps to determine the validity of the hypotheses and draw conclusions based on evidence rather than opinions, random guesses, or conclusions drawn from other experiments.

Measurement plays a crucial role in science as it provides quantifiable data that allows for precision and accuracy in observations and experiments. Without measurements, scientific findings would lack consistency and reliability.

Fahrenheit is a larger unit of measurement than Celsius, where 1 degree Fahrenheit is equivalent to approximately 0.5556 degrees Celsius.

The correct term for the quantity of matter present in an object is mass, which is different from volume, density, and weight.

Density is calculated by dividing mass by volume. In this case, the substance has a mass of 1.5 grams in 1 cubic centimeter, so the density is 1.5 grams per cubic centimeter.

The gravitational force on the moon is approximately 16.5% of that on Earth, so your mass would remain the same at 70 kg on the moon.

A thermometer is specifically designed to measure temperature, while a barometer measures air pressure, a hygrometer measures humidity, and an anemometer measures wind speed.

The metric system is widely used in the scientific community and by most countries around the world due to its ease of conversion and consistent units of measurement.