Biod 171 Module 3 Exam Questions with 100% Correct Answers (Latest 2023)

A nanometer is defined as: A. 10-3 B. 10-6 C. 10-9 D. 10-12 Correct Answer (C.) 10-9 True or False: A nanometer (10-9) is longer than a micrometer (10-6). Correct Answer FALSE: A nanometer is 1,000 times smaller than a micrometer. Resolution and contrast are two critical factors that influence your ability to see an object. Explain each. Correct Answer Answer: Resolution refers to the distance between two objects at which the objects can be seen as separate. Poor or low resolution means two (or more) objects may appear as one. Contrast is the difference in light absorbance between two objects. Poor contrast gives a high background and makes the visualization of multiple objects difficult. For instance, trying to identify 2 dark colored objects at night (low light = low contrast) versus the same 2 objects in the middle of a sunny afternoon (bright light against 2 dark objects = high contrast). Assuming a fixed ocular identify the part of the microscope you would adjust to enhance the magnification of a sample. A. Objective B. Condenser C. Iris Diaphragm D. Eye piece Correct Answer (A.) Objective - Only the oculars (eyepiece) and the objectives contribute to the magnification of the sample. Since the eyepiece is fixed, only the objectives could be altered. What is the total magnification (relative to your eye) of a sample imaged with a 60x objective and a 10x eyepiece? Show your math. Correct Answer (60x objective) x (10x ocular) = 600x The total magnification is multiplicative between two lenses, therefore the total magnification will be 600x What is the total magnification (relative to your eye) of a sample imaged with a 20x objective and a 15x eyepiece? Show your math. Correct Answer 20 x 15 = 300x magnification