for 589-nm light, calculate the critical angle for the following materials surrounded by air.

Solution

From Equation ,sinθ
c
​
=
n
1
​

n
2
​

​
, where n
2
​
=1.000293. Values for n
1
​
=1.309
θ
c
​
=sin
−1
(
1.309
1.000293
​
)=49.8
∘