February/March 2026 Paper 22

2026 · 40 questions · 40 parts · 40 marks

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19Refraction Total Internal ReflectionMedium1 mark

A ray of light travels from air into a glass block.

	in air	in glass
speed of ray	$v_{a}$	$v_{g}$
wavelength of ray	$λ_{a}$	$λ_{g}$
frequency of ray	$f_{a}$	$f_{g}$

Three suggestions as to how the refractive index of glass

n

may be calculated are listed.

1
$n = \frac{v _{a}}{v _{g}}$
2
$n = \frac{λ _{a}}{λ _{g}}$
3
$n = \frac{f _{a}}{f _{g}}$

Which suggestions are correct?