What are the different types of optical instruments?
An optical instrument (or “optic” for short) is a device that processes light waves (or photons), either to enhance an image for viewing or to analyze and determine their characteristic properties. Common examples include periscopes, microscopes, telescopes, and cameras.
Is a mirror an optical device?
A mirror is an optical device which can reflect light. Usually, however, only those devices are meant where the angle of reflection equals the angle of incidence (see Figure 1). This means that diffraction gratings, for example, are not considered as mirrors, although they can also reflect light.
How can we get different magnifications in this optical instruments?
c) We can get different magnifications by using the eye piece with different focal lengths.
Which optical instrument forms a real image?
camera
Is the image formed by a compound microscope real or virtual?
With the compound microscope, this intermediate image is real, formed by the objective lens. In all cases, the function of the eyepiece is to form a virtual, magnified image for your eye to view.
What type of image do you observe in microscope?
The objective lens is positioned close to the object to be viewed. It forms an upside-down and magnified image called a real image because the light rays actually pass through the place where the image lies. The ocular lens, or eyepiece lens, acts as a magnifying glass for this real image.
Where are the two lenses located in a compound microscope?
A compound microscope consists of two lenses, an objective lens (close to the object) and an eye lens (close to the eye).
Do we see inverted image in compound microscope?
The classic compound microscope magnifies in two steps: first with an objective lens that produces an enlarged image of the object in a ‘real’ image plane. The ocular lens makes the light rays spread more, so that they appear to come from a large inverted image beyond the objective lens.
Why is letter E upside down microscope?
The letter appears upside down and backwards because of two sets of mirrors in the microscope. This means that the slide must be moved in the opposite direction that you want the image to move.
Why is the image under a microscope inverted?
The reason compound microscopes invert images lies in the focal length of the objective lens. The image focused by the lens crosses before the eyepiece further magnifies what the observer sees, and the objective lens inverts the image because of the lens’ curvature. This real image is inverted at the focal length.
What makes letter E suitable for observation under microscope?
The printed lowercase letter “e” is suitable for observation under the microscope because it can still be identified even if only part of it is visible. This is because letter “e” is asymmetrical both vertically and horizontally. You can see clearly how its image is changed under the microscope.
How does the letter E as seen through the microscope differ?
When you look into the microscope you see a circle so you draw it like you see it. How does the letter “e” as seen through the microscope differ from the way an “e” normally appears? It is inverted, not solid, has rough edges, and shows the texture of the paper.
How does the letter D look under the microscope?
Why is it a good idea to place the microscope at least ten centimeters from the edge of the table? How does the letter d appear under the microscope? It looks like a p because its enlarged and inverted. When you move the slide to the left, what direction does it appear to move?
Did the letter appear in the same orientation when viewed through the microscope?
Compare the orientation of the letter “e” as viewed through the microscope with the letter “e” viewed with the naked eye on the slide. This demonstrates that in addition to being magnified the image is inverted….
| 13 LIGHT SOURCE | 3 MECHANICAL STAGE |
|---|---|
| 7 ARM | 12 BASE |
Why is it not good to tilt the microscope while observing a wet slide?
Answer. Because the water or fluid might leak along the slide and stage and stain or damage the other parts of the Microscope .
Why should you not to tilt the microscope?
Do not tilt the microscope or the eyepieces may fall off and be damaged. Use ONLY Lens paper to clean the eyepiece, objective lenses, and condenser lens. Any other type of paper may make permanent scratches.
Why is it important not to tilt the microscope?
Because if you have wet mount, the fluid or specimen may leak and scatter or stain along the other parts of the microscope.
What are the disadvantages of using the HPO?
disadvantage is that you might break the slide because the objective will be very near the specimen.
Which magnification provides the largest FOV?
4x
What is the advantages and disadvantages of using the HPO?
Answer. The advantage is you wouldn’t see much of the specimen itself, only the details of the object you’re pointing while the disadvantage is magnification is possible with most standard, monocular (single) eyepiece.
How much is the letter E you are now viewing under the scanner magnified under the LPO?
LPO usually magnifies the specimen 10 times than its original size while HPO magnifies 40x. The magnification of the letter “e” that you are talking about doesn’t depend only on the objective used but also in the magnification of the ocular lens of the microscope.
How much is the letter E you are now viewing under the scanner magnified if the eyepiece is 10x and scanner is 5x?
Answer depends on what eyepiece and objective are currently used. If the eyepiece is 10x and scanner is 5x, then it is magnified 50x or 50 times. If the eyepiece is 10x and the LPO used is 10x, then it is magnified 100x. If the eyepiece is 10x and the HPO is 40x, then it is magnified 400x.
Why do you have to watch from the side when changing objectives?
If you look in the microscope while changing the objectives, the glass or the lens can break. The glass are so brittle that it can break easily. So we look from the side when changing the objectives to prevent it from breaking.
What are the two parts of the light microscope magnify the image of an object?
Answer Expert Verified. The compound microscope has two systems of lenses for greater magnification, 1) the ocular, or eyepiece lens that one looks into and 2) the objective lens, or the lens closest to the object.