Question

12. The diagram shows light passing from air into glass.
air glass
NOT TO
SCALE
60°
30°
normal-
1
The glass has a refractive index of 1.5.
What is the angle of refraction in the glass?

Answer 1

Answer:

and the answer is. 30°

Answer 2

Angle of refraction is $19^{o}$.

What is refraction?

• It is a particle property of light.
• When light travels from one medium to another, the speed of light varies depending on the density of the medium which is why it tends to bend away or towards the normal.

What is normal?

Normal is an imaginary perpendicular line drawn at the interface of two mediums.

What is refractive index?

• It is measure that gives how much has the light bent while passing from medium to another.
• Refractive index of any medium is defined as the ratio of speed of light in vacuum to the speed to light in that medium.
• It has no units.
• According to Laws of Refraction, refractive index of a medium is given as ratio of sine value of angle of incident to the sine value to angle of refraction.

Angle of incidence is the angle made by incident ray with the normal.

Angle of refraction is the angle made by refracted ray with the normal.

Given:

Angle of incidence (i) = $30^{o}$

Refractive index of glass = 1.5

To find: Angle of refraction (r)

Calculation:

Refractive index = sin i / sin r

1.5 = sin 30 / sin r

sin r = 1/3

r = $19^{o}$

"Your question might be referring to the figure below."