PUC Karnataka Science Class 12Department of Pre-University Education, Karnataka
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# You Are Given the Following Three Lenses. Which Two Lenses Will You Use as an Eyepiece and as an Objective to Construct a Compound Microscope? - PUC Karnataka Science Class 12 - Physics

#### Question

You are given the following three lenses. Which two lenses will you use as an eyepiece and as an objective to construct a compound microscope?

 Lenses Power (D) Aperture (cm) L1 3 8 L2 6 1 L3 10 1

#### Solution

For a compound microscope, an objective is so chosen that its aperture is small and focal length is very small whereas an eyepiece is so chosen that its aperture is large and focal length is moderate. Now,
focal length of L1, f1 = 1/3 = 0.33 m
focal length of L2​, f2 = 1/6 = 0.166 m
focal length of L3, f3 = 1/10 = 0.1 m

Therefore, from the above calculation of focal length and given aperture, it shows that L3 will be suitable for objective and L1 for eyepiece.

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Solution You Are Given the Following Three Lenses. Which Two Lenses Will You Use as an Eyepiece and as an Objective to Construct a Compound Microscope? Concept: Optical Instruments - The Microscope.
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