Grade 12Modern Physics

Angle of prism (mu = 1.5) is 30degree when monochromatic light is incident perpendicular to surface at what angle will it deviate?
a) 18degree 36minute
b) 22degree 38minute
c) 18degree
d) 22degree 1minute

Question image for Angle of prism (mu = 1.5) is 30degree when monoch

Prachi

6 Years agoGrade 12

2 Answers

Arun

6 Years ago

Dear student

We know that

n = sin i /sinr

1.5 = sin i / sin 30°

sin i = 0.75

On solving i = 18°36'

Hence Option A is correct.

Vikas TU

6 Years ago

Dear student

The above explanation is very much incorrect , I feel sorry for that,

You can use the formula $\frac{n(prism)}{n(air)}$

This is given by {Sin(A+dm)/2} / Sin(A/2) = $\frac{n(prism)}{n(air)}$

Put all the values in it A = 30 , and dm is deviation here,

So , the angle of deviation will comw out to be 15 degree and 16 minute , The ans given in the option is not matching ,

Ans is matching when tou will take (A+dm)/2 , it is 22 degree 83 minute.

Hope this helps

Good Luck

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Angle of prism (mu = 1.5) is 30degree when monochromatic light is incident perpendicular to surface at what angle will it deviate? a) 18degree 36minute b) 22degree 38minutec) 18degreed) 22degree 1minute

Prachi

2 Answers

Arun

Vikas TU

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