A glass prism of angle A = 60^(@) gives ...

A glass prism of angle `A = 60^(@)` gives minimum angle of deviation `theta ~~ 30^(@)` with the maximum error of `1^(@)` when a beam of parallel light passed through the prism during an experiment. Find the permissible error in the measurement of refractive index `mu` of the material of the prism.

`(100pi)/(180)%`

`(5pi)/(180)%`

`(50pi)/(180)%`

`(5pi)/(18)%`

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