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Light passes successively through two polarimeters tubes each of length `0.29m`. The first tube contains dextro rotatory solution of concentration `60kgm^-3` and specific rotation `0.01 rad m^2kg^-1`. The second tube contains laevo rotatory solution of concentration `30kg//m^3` and specific rotation `0.02 rad m^2kg^-1`. The net rotation produced is

A

(a) `15^@`

B

(b) `0^@`

C

(c) `20^@`

D

(d) `10^@`

Text Solution

Verified by Experts

The correct Answer is:
B
Rotation produced `theta=Slc`
Net rotation produced `theta_r=theta_1-theta_2=l(S_1c_1-S_2c_2)`
`=0.29xx[0.01xx60-0.02xx30]=0`
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