In an electron microscope, if the potential is increased from 20 kV to 80 kV, the resolving power R of the microscope will become :

Options

A. R
B. 2R
C. 4R
D. `(R)/(2)`

Answer

B

Explanation

Resolving power `R prop V^(1//2)`
here `V_(1)=20 KV`
`V_(2)=20 KV`
`:.(V_(2))/(V_(1))=4`
`:.` So resolving power becomes 2R.