Question

What is the difference between a compound microscope and a simple microscope?

Answer 1

A simple microscope is used to produce an enlarged image of an object placed within its focal length. On the other hand, a compound microscope has two sets of lenses, an ocular or eyepiece lens and the objective lenses. ... The compound microscope has a much higher level of magnification and is adjustable.

Answer 2

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$\huge\mathfrak\purple{simple\:microscope}$

(See fig 1st)

It is used for observing magnified images of objects. It is consists of a converging lens of small focal length.

Magnifying Power

(i) When final image is formed at least distance of distinct vision (D), then M=1+d/f

where, f= focal length of the lens.

(ii) When final image is formed at infinity, then M = D/f

$\huge\mathfrak\purple{Compound\:Microscope}$

(See fig. 2nd)

It is a combination of two convex lenses called objective lens and eye piece separated by a distance. Both lenses are of small focal lengths but fo < fe, where fo and feare focal lengths of objective lens and eye piece respectively

Magnifying Power

M = vo / uo {1 + (D/fo)

Where vo= distance of image, formed by objective lens and

uo = distance of object from the objective

(ii) When final image is formed at infinity, then

M = vo/uo . D/fe

$\huge\mathfrak\purple{Astronomical\:microscope}$

(See fig. 3rd)

It is also a combination of two lenses, called objective lens and eye piece, separated by a distance. It is used for observing distinct images of heavenly bodies like stars, planets etc

Magnifying Power

(i) When final image is formed at least distance of distinct vision (D), then M = fo/fe {1+ (D/fe)} where foand fe are focal lengths of objective and eyepiece respectively.

Length of the telescope (L) = (fo + ue)

where, ue = distance of object from the eyepiece.

(ii) When final image is formed at infinity, then M = fo/fe

Length of the telescope (L) = fo + fe

For large magnifying power of a telescope fo should be large and feshould be small.

For large magnifying power of a microscope; fo < fe should be small.

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