HARD
Upper Secondary: IGCSE
IMPORTANT
Earn 100

Explain the meaning of the words total and internal in the expression ' total internal reflection'.

Important Questions on Light

MEDIUM
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 13 - Light>Questions>Q 13.18
The critical angle for water is 49°. If a ray of light strikes the upper surface of a pond at an angle of incidence of 45°,  will it be totally internally reflected? Explain your answer.
HARD
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 13 - Light>Questions>Q 13.19
The refractive index of water is η=1.33. Calculate the critical angle of water.
HARD
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 13 - Light>Questions>Q 13.19
Using a protractor, draw an accurate ray diagram to show how a ray of light, striking the internal surface of water at the critical angle, is refracted.
EASY
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 13 - Light>Questions>Q 13.2
The critical angle for a new type of plastic is found to be 40°. What is the refractive index of this material?
MEDIUM
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 13 - Light>Questions>Q 13.21
Sketch a diagram to show how a ray of light can trace along a curved glass fibre. Indicate the points where total internal reflection occurs.
HARD
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 13 - Light>Questions>Q 13.22
Why must high-purity glass be used for optical fibres used in telecommunications?
MEDIUM
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 13 - Light>Questions>Q 13.23
Draw a diagram to show the difference in shape between a converging lens and a diverging lens.
HARD
Upper Secondary: IGCSE
IMPORTANT
Cambridge IGCSE® Physics Coursebook Second Edition>Chapter 13 - Light>Questions>Q 13.24
Draw a ray diagram to show how a converging lens focuses parallel rays of light.