Edexcel A-Level Physics Refraction at a Boundary

Practise Edexcel A-Level Physics refraction at a boundary through Snell’s law, refractive index graphs, light speed in media and ray-direction changes.

Exam points

use Snell’s law with refractive indices and angles to calculate refraction at boundaries
derive refractive index from graph gradients, ray geometry or n=c/v speed calculations
explain direction changes from speed changes, normals and monochromatic or white-light effects

[Maximum number: 4]

Light is a transverse wave.

(a)

Two prisms, A and B, made from different types of glass are placed in contact as shown. An incident ray of light enters prism A.

Figure for Question (a) — Edexcel A-Level Physics AS

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[ 4 ]

(i)

State why the incident ray of light does not change direction as it enters prism A .

[ 1 ]

(ii)

Calculate the angle of refraction as this ray of light travels across the boundary between prism A and prism B.
refractive index of glass in prism A=1.40
refractive index of glass in prism B=1.55

Angle of refraction =

[ 3 ]

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2.3.45 - Refraction at a boundary question 1

Question (a)

Question (i)

Question (ii)