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In a p type semiconductor , germanium is...

In a p type semiconductor , germanium is doped with

A

a) aluminium

B

b) boron

C

c) gallium

D

d) All of these

Text Solution

Verified by Experts

The correct Answer is:
5
Focal length of the silvered lends `=-(4)/(2)=-2m`
`(f_(l))omega4(f_(l))a=4R`
`-(1)/(F)=(2)/((f_(l))Omega)-(1)/(f_(m))`
`(2)/(4R)-(!)/(-(R)/(2))=(5)/(2R)`
`impliesR=-(5F)/(2)=5m`
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