As shown in the figure below, a light ray is incident normal to one face of a 30

Question

As shown in the figure below, a light ray is incident normal to one face of a 30°-60°-90° block of sodium chloride that is immersed in water.

(a) Determine the exit angle 3 of the ray.
3 =  °

(b) A substance is dissolved in the water to increase the index of refraction n2. At what value of n2 does total internal reflection cease at point P?
n2 =

As shown in the figure below, a light ray is incident normal to one face of a 3 09-60 -9 block of sodium chloride that is immersed in water. 60.00 P 2 30.0 (a) Determine the exit angle 63 of the ray. (b) A substance is dissolved in the water to increase the index of refraction n2 At what value of n2 does total internal reflection cease at point P? n2 Need Help? Talk to a Tutor

Explanation / Answer

a)

Theta 1 = 60,

Theta 3 =30 (simple geometry)
Then: n2 sin(Theta3) = n1 sin30.
b)

Snell's Law: n1 sin(Theta1) >= n2
When total internal reflection cease at point P:
n2 > n1 sin60

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.