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Compound Microscope MCQ - NEET Practice Questions with Answers

Edited By admin | Updated on Sep 25, 2023 25:23 PM | #NEET

Quick Facts

  • Compound Microscope is considered one of the most asked concept.

  • 5 Questions around this concept.

Solve by difficulty

If the focal length of the objective lens is increased, then the magnifying power of:

The image formed by an objective of a compound microscope is:

Concepts Covered - 1

Compound Microscope

Compound Microscope: 

A compound microscope is of two converging lenses called objective and eye lens. It is used to view magnified images of small objects on a glass slide. It can achieve higher levels of magnification than stereo or other low-power microscopes and reduce chromatic aberration.

       

feyelens >fobjective  and ( diameter )eyelens >( diameter )objective 
Intermediate image is real and enlarged. The final image is magnified, virtual and inverted.
Here in the diagram
uo= Distance of object from objective (o),
vo= Distance of image ( AB ) formed by objective from objective,
ue= Distance of AB from eye lens,
ve= Distance of final image from eye lens,
fo= Focal length of objective,
fe= Focal length of eye lens.

Case 1: Final image is formed at D : Magnification

mD=vouo(1+Dfe)
 microscope tube (distance between two lenses) is LD=ve+ue.
Generally, object is placed very near to the principal focus of the objective hence uofo. The eye piece is also of small focal length and the image formed by the objective is also very near the eyepiece.

So voLD, the length of the tube.
Hence, we can write

mD=Lfo(1+Dfe)
 

Case 2: Final image is formed at : Magnification
m=v0u0Dfe and length of tube L=v0+fe

In terms of length

m=(Lfofe)Dfofe

- For large magnification of the compound microscope, both fo and fe should be small.
- If the length of the tube of microscope increases, then its magnifying power increases.
- The magnifying power of the compound microscope may be expressed as M=mo×me where m0 is the magnification of the objective and me is magnifying the of eyepiece.

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Compound Microscope

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Compound Microscope

Concepts of Physics Part-1

Page No. : 422

Line : 19

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