A -diameter microscope objective has a focal length of . What object distance gives a lateral magnification of ?
The object distance is .
We have given that:
focal length= .
We need to find object distance which gives a lateral magnification of .
Object is not close to the focal point .
Approximation, lateral magnification is given:
represent microscope tube length.
Let us find the value of .
FIGURE shows a simple zoom lens in which the magnitudes of both focal lengths are . If the spacing , the image of the converging lens falls on the right side of the diverging lens. Our procedure of letting the image of the first lens act as the object of the second lens will continue to work in this case if we use a negative object distance for the second lens. This is called a virtual object. Consider an object very far to the left of the converging lens. Define the effective focal length as the distance from the midpoint between the lenses to the final image.
a. Show that the effective focal length is
b. What is the zoom for a lens that can be adjusted from to ?
Your task in physics laboratory is to make a microscope from two lenses. One lens has a focal length of 2.0 cm, the other 1.0 cm. You plan to use the more powerful lens as the objective, and you want the eyepiece to be 16 cm from the objective.
a. For viewing with a relaxed eye, how far should the sample be from the objective lens?
b. What is the magnification of your microscope?
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