Question

A ray of light is incident on a glass slab at an angle of 45°. If the refractive index of water will be 1.6, then what is the angle of refraction?​

Answer 1

Answer:

The answer is 26.2°

Explanation:

Step 1: Write down what you know and what you want to know.

i = 45°

n = 1.6

r = ?

Step 2: Write down the equation for Snell's law. Since we want to know r, rearrange it to make sin r the subject.

n = sin i / sin r

sin r = sin i / n

Step 3: Substitute values and calculate sin r.

sin r = sin 45° / 1.6

       = 0.442

Step 4: Use the sin(-1 radian) function on your calculator to find r. (This will tell you the angle whose sine is 0.442.)

r = sin(-1 radian) 0.442 = 26.2°

Answer 2

Answer:

26°

Explanation:

refractive index = sine of angle of incidence/sine of angle of refraction

1.6=sin45°/sin r

sin r=0.7/1.6

sin r=0.4375

sin r=sin 26° (approx.)

=> r=26°