Скачать или смотреть O LEVEL | LIGHT | PART 1 | 2024 | Physics By Akhtar Mehmood

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3.2 Light
3.2.1 Reflection of light
1 Define and use the terms normal, angle of incidence and angle of reflection
2 Describe an experiment to illustrate the law of reflection
3 Describe an experiment to find the position and characteristics of an optical image formed by a plane
mirror (same size, same distance from mirror as object and virtual)
4 State that for reflection, the angle of incidence is equal to the angle of reflection and use this in
constructions, measurements and calculations
3.2.2 Refraction of light
1 Define and use the terms normal, angle of incidence and angle of refraction
2 Define refractive index n as n = sin i
sin r
; recall and use this equation
3 Describe an experiment to show refraction of light by transparent blocks of different shapes
4 Define the terms critical angle and total internal reflection; recall and use the equation
n = 1
sin c
5 Describe experiments to show internal reflection and total internal reflection
6 Describe the use of optical fibres, particularly in telecommunications, stating the advantages of their use in
each context
Cambridge O Level Physics 5054 syllabus for 2023, 2024 and 2025. Subject content
20 www.cambridgeinternational.org/olevel Back to contents page
3.2 Light continued
3.2.3 Thin lenses
1 Describe the action of thin converging and thin diverging lenses on a parallel beam of light
2 Define and use the terms focal length, principal axis and principal focus (focal point)
3 Draw ray diagrams to illustrate the formation of real and virtual images of an object by a converging lens
and know that a real image is formed by converging rays and a virtual image is formed by diverging rays
4 Define linear magnification as the ratio of image length to object length; recall and use the equation
linear magnification = image length
object length
5 Describe the use of a single lens as a magnifying glass
6 Draw ray diagrams to show the formation of images in the normal eye, a short-sighted eye and a
long-sighted eye
7 Describe the use of converging and diverging lenses to correct long-sightedness and short-sightedness
3.2.4 Dispersion of light
1 Describe the dispersion of light as illustrated by the refraction of white light by a glass prism
2 Know the traditional seven colours of the visible spectrum in order of frequency and in order of wavelength