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Standard XII
Physics
Compound Microscope
Compound micr...
Question

Compound microscope is used to

A
get small magnification of very minute obects
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B
get huge magnification of very minute objects
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C
get small magnification of very distant objects
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D
get large magnification of very distant objects
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Solution

The correct option is B get huge magnification of very minute objects
Compound microscope is used for the study of microscopic objects. Its purpose is to get huge magnification of very tiny objects.

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Q. A wire mesh consisting of very small squares is viewed at a distance of 8 cm through a magnifying converging lens of focal length 10 cm, kept close to the eye. The magnification produced by the lens is.
Q. (a) Draw the ray diagram showing the formation of image by a compound microscope.
(b) Show that in order to achieve large magnification in a compound microscope the magnitude of focal length of objective and eye piece should be small.
Q.
Since the objective lens merely forms an enlarged real image that is viewed by the eyepiece, the overall angular magnification M of the compound microscope is the product of the lateral magnification m1 of the objective and the angular magnification M2 of the eyepiece. The former is given by
m1=S′1S1
Where S1andS′1 are the object and image distance for the objective lens. Ordinarily the object is very close to the focus, resulting in an image whose distance from the objective is much larger than the focal length f1. Thus S1 is approximately equal to f1 and m1 =−S′1f1, approximately. The angular magnification of the eyepiece from M=−u′u=y/fy/25=25f (f in centimeters) is M2=25cm/f2, Where f2 is the focal length of the eyepiece, considered as a simple lens. Hence the overall magnification M of the compound microscope is, apart from a negative sign, which is customarily ignored,
M=m1M2=(25cm)S′1f
The magnifying power given in the paragraph is approximate. What is maximum magnification?

Q.

In a compound microscope magnification will be large, if the focal length of the eye piece is


Q. In a compound microscope, magnification will be large, if the focal length of the eye piece is
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