Question

vii] A thnin hollow prism of refracting angle 3°, filled with water gives a deviation of 1°. What is the R.I of water?​

Answer 1

Answer:

So, we know the formula angle of deviation (δ) = angle of prism (A)(1 – refractive index (μ))

⇒δ=A(1−μ)

We need to find the refractive index of water here.

It is given that δ=1 and A=3

On putting the values on above equation we get the value of equation as:

1=3(1−μ)μ=1−13=23=1.33

1.3333... IS THE RI OF WATER

Answer 2

Given,

δ=1degree

A=3degree


μ=? refractive index of water

For small angle of A (<10degree)

δ=(μ−1)A

μ−1= A upon δ
​
= 3 upon 1
​


μ= 3 upon 1 +1

μ= 3 upon 4
​
=1.333.




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