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- All other things being equal, the objective lens with the highest value for numerical aperture (N.A.) will always have the lowest______? A. Field Of View B. Magnification C. Image Quality D. Limit Of ResolutionYou should always put oil on the slide before you try to get it into focus at low magnification. You should always put oil on the slide before you try to get it into focus at low magnification. True FalseThe numerical aperture of the an objective lens: indicates magnification indicates the clarity indicates light capturing ability indicates the approprite use
- Why are stereomicroscopes often referred to as dissecting microscopes? Stereomicroscopes come apart (dissect) easily. The large distance between the lens and the specimen makes them ideal for dissections. They are good for viewing much smaller objects. Only a few specimens will fit under the stereomicroscope. The two eyepiece lenses on a stereomicroscope give a better perception of depth.what happens to brightness of the field of view when you switch to the high power objectiveYou should always position the cells or tissues in the center of view before increasing magnification, because... You know that the image will move right as you move the slide to the left. You know that the image will move up as you move the slide down. You know that the center of the field of view will be unchanged. This is the best way to avoid breaking the slide with an objective
- Contrast for a specimen may be adjusted by _____. Question options: Adjusting the iris diaphragm Lowering the stage Turning off the substage condenser light source Changing the objective lensExplain why an image must be centered in the field of view when using low power before moving to a high power magnification.John observed bacteria at 100X under the oil immersion and then decided to go back to 40X objective by raising the oil objective a little to avoid the damage to objective lens. Critique his technique.
- Which of the following parts was absent from Leeuwenhoek’smicroscopes?a. focusing screwb. lensc. specimen holderd. condenserWhile viewing an object under low power you see a small organism at the edge of the field of vision. You move to the high-power lens, but the organism is no longer visible. What has occurred? How do you correct it?The human eye is much like a camera—yet, when a camerashutter is left open and the camera is moved, the image willbe blurred. But when you move your head with your eyesopen, you still see clearly. Explain
