Microscopes

How do you calculate the total magnification of a compound light microscope?

• High power lens X low power lens

• Eye piece lens + objective lens

• Eye piece lens X objective lens

• Eye piece lens - objective lens

When looking through a microscope to examine a skin cell, the eye piece lens is 10x and the objective lens is 40x. What is the total magnification?

• 400x

• 30x

• 50x

• 4x

To locate a specimen on a prepared slide with a compound microscope, a student should begin with the low power objective rather than the high power objective because the

• the field of vision is smaller under low power than under high power.

• the field of vision is larger under low power than under high power.

• specimen does not need to be stained for observation under low power but needs to be stained for high power

• portion of the specimen that can be observed under low power is less than the portion that can be observed under high power.

After switching from a high power to a low power objective lens of a compound light microscope, the area of the low power field will appear?

• larger and brighter

• larger and darker

• smaller and brighter

• smaller and darker

While viewing a specimen under high power of a compound light microscope, a student noticed that the specimen was out of focus. Which part of the microscope should the students turn to obtain a clearer image under high power?

• eyepiece

• fine adjustment

• coarse adjustment

• diaphragm

Which activity might lead to the damage of a microscope and specimen?

• Cleaning the ocular with lens paper

• Focusing with low power before moving the high power into position

• Using the coarse adjustment to focus the specimen on high power

• Adjusting the diaphragm to change the amount of light

How does the view of the specimen change when you put it under a microscope?

• Upside down and backwards

• Upside down and forwards

• Right side up and backwards

• Right side up and forwards

A cover slip should be used for preparing a

• frog for dissection

• solution for iodine for testing

• wet mount for elodea

• a test to determine the pH of a solution

A coverslip should be slowly lowered at a 45 degree angle onto a slide in order to

• prevent the slide from being scratched

• stop the loss of water from under the cover slip

• ensure the specimen stays alive

• reduces the formation of air bubbles