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  • A travelling microscope is used to determine the refractive index of a glass slab. If 40 divisions are there in <img alt="\mathrm{1 \mathrm{~cm}}" src="https://entrancecorner.oncodecogs.com/gif.lat

A travelling microscope is used to determine the refractive index of a glass slab. If 40 divisions are there in \mathrm{1 \mathrm{~cm}} on main scale and 50 Vernier scale divisions are equal to 49 main scale divisions, then least count of the travelling microscope is______ \mathrm{\times 10^{-6} \mathrm{~m}}.

Option: 1

5


Option: 2

-


Option: 3

-


Option: 4

-


Answers (1)

best_answer

\mathrm{1 M S D =\frac{1}{40} \mathrm{~cm}=\frac{1}{40} \mathrm{~cm}}

\mathrm{50\text { VSD } =49 \, M S D }

\mathrm{L C =1 M S D-\text { 1VSD }}
        \mathrm{=1 M S D-\frac{49}{50} M S D}

\mathrm{L C =\frac{1}{50} M S D=\frac{1}{2000} \mathrm{~cm}}
\mathrm{L C =5 \times 10^{-6} \mathrm{~m}}

Posted by

manish painkra

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