Practise

Question bank

Original exam-style questions, mapped to your syllabus. Answers are checked for mathematical equivalence and every attempt updates your mastery.

TopicSkillDifficulty

12 questions

SA-PX-RF-0011 markL1 FoundationCalculatorSnell’s law

Calculate the speed of light in glass of refractive index

1.50

, in units of

10^8

m s⁻¹. (

c=3.00\times10^8

m s⁻¹)

Salam Academy Original Practice · Proposed mark scheme

SA-PX-RF-0031 markL1 FoundationCalculatorCritical angle

Calculate the critical angle, in degrees, for glass of refractive index

1.50

in air.

Salam Academy Original Practice · Proposed mark scheme

SA-PX-RF-0051 markL1 FoundationCalculatorCritical angle

Total internal reflection can happen only when light travels

Salam Academy Original Practice · Proposed mark scheme

SA-PX-RF-0081 markL1 FoundationCalculatorOptical fibres

One purpose of the cladding on an optical fibre is to

Salam Academy Original Practice · Proposed mark scheme

SA-PX-RF-X011 markL1 FoundationCalculatorSnell’s law

Light travels at

2.25\times10^8

m s⁻¹ in water. Calculate the refractive index of water. (

c=3.00\times10^8

m s⁻¹)

Salam Academy Original Practice · Proposed mark scheme

SA-PX-RF-X031 markL1 FoundationCalculatorCritical angle

Calculate the critical angle in degrees for water (

n=1.33

) in air.

Salam Academy Original Practice · Proposed mark scheme

SA-PX-RF-0022 marksL2 StandardCalculatorSnell’s law

Light passes from air into glass (

n=1.50

) at

40^\circ

to the normal. Calculate the angle of refraction in degrees.

Salam Academy Original Practice · Proposed mark scheme

SA-PX-RF-0042 marksL2 StandardCalculatorOptical fibres

An optical fibre has core refractive index

1.48

and cladding refractive index

1.46

. Calculate the critical angle at the core–cladding boundary in degrees.

Salam Academy Original Practice · Proposed mark scheme

SA-PX-RF-0061 markL2 StandardCalculatorOptical fibres

Modal dispersion in an optical fibre is reduced by

Salam Academy Original Practice · Proposed mark scheme

SA-PX-RF-X022 marksL2 StandardCalculatorSnell’s law

Light passes from water (

n=1.33

) into glass (

n=1.50

) at

30^\circ

to the normal. Calculate the angle of refraction in degrees.

Salam Academy Original Practice · Proposed mark scheme

SA-PX-RF-X041 markL2 StandardCalculatorOptical fibres

Material dispersion in an optical fibre is reduced by

Salam Academy Original Practice · Proposed mark scheme

SA-PX-RF-0072 marksL3 ExamCalculatorCritical angle

A transparent block has a critical angle of

35^\circ

in air. Calculate its refractive index.

Salam Academy Original Practice · Proposed mark scheme