Question

Find angle of incidence if angle of refraction is 30° for a glass having refractive index
1.5.
(2) 35.230 (6) 48.590 (c) 40.120 (d) 55​

Answer 1

Pls see the attachment

Ans is 48.590

Answer 2

Given:

Angle of refraction = 30°

Refractive index = 1.5

To Find: Angle of Incidence

Calculation:

• Refractive index of any medium is defined as ratio of speed of light in vacuum to the speed of light in that particular medium.
• μ = $\frac{c}{v}$
• Refractive index gives the degree of change in direction of light wave or the degree of bending of light ray when it travels from one medium to another.
• Bending in light ray is observed due to difference in densities of medium.
• Also refractive index is given as ratio of sine value of angle of incidence to the sine value of angle of refraction.

• μ = $\frac{sin i}{sin 30}$

sin i = 1.5 * 0.5

sin i = 0.75

i = 48.590

Answer:

Angle of incidence = 48.590°