Question

1. Which of the following is Snell's law.
[ ]
a) n, sin i = sin r/
b) n,/n, = sin r/sini
c) n/n, = sin r/sin i
d) n, sin i = constant
2. The refractive index of glass with respect to air is 2. Then the critical angle of glass-air
interface is
[ ]
b) 45°
c) 30°
d) 60°
3. Total internal reflection takes place when the light ray travels from............... [
[ ]
a) rarer to denser medium
b) rarer to rarer medium
c) denser to rarer medium
d) denser to denser medium
a) 0°
ans this question please​

Answer 1

Answer:

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Answer 2

Answer:

1. b

2. c

3. c

Explanation:

1.Snell's Law is especially important for optical devices, such as fiber optics. Snell's Law states that the ratio of the sine of the angles of incidence and transmission is equal to the ratio of the refractive index of the materials at the interface.

2.

We know that the critical angle is given by:-

C=sin^-1 (1/2 where μ=refractive index of denser

medium relative to rarer medium

Here, μ=2

Hence, C=sin^-1(1/2)

⟹C=30°

3.Total internal reflection always place when a light ray travels from an optically denser medium to a rarer medium.

For total internal reflection, angle of incidence must be greater than the critical angle