Monday 26 August 2013


LIGHT (Overview): Form 4 Chapter 5

Reflection in Mirrors; Refraction through Lenses, Etc.

1.    Reflection of Light
a.       Law of Reflection
b.      Image formed by reflection in
                                                               i.      plane mirror; characteristics of image and applications
                                                             ii.      convex mirror, characteristics of image and applications
                                                            iii.      concave mirror, characteristics of image and applications
c.       Ray diagrams for reflection

2 .   Refraction of Light
a.       Law of refraction
b.      Refractive index, n
c.       Natural phenomena due to refraction
d.      Total internal reflection
                                                               i.      Internal reflection
                                                             ii.      Total internal reflection
                                                            iii.      Critical angle
                                                           iv.      Natural phenomena due to total internal reflection
                                                             v.      Applications of total internal reflection
1.      Prism periscope
2.      Prism binoculars
3.      Optical fibre
4.      Cutting of diamonds

3.    Lenses
a.       Convex lenses and Concave lenses
b.      Terminologies and Lens Formula
                                                               i.      Focal length, f.
                                                             ii.      Focal point, F.
                                                            iii.      Object distance, u
                                                           iv.      Image distance, v.
                                                             v.      Magnification, m = v/u
                                                           vi.      Power of lenses, P = 1/f
                                                          vii.      Lens formula: 1/f = 1/u + 1/v
c.       Uses of lenses in optical devices
                                                               i.      Magnifying glass
                                                             ii.      Compound microscope
                                                            iii.      Astronomical telescope
                                                           iv.      Camera
                                                             v.      Slide projector
                                                           vi.      Photocopier
                                                          vii.      Short-sighted spectacles
                                                        viii.      Long-sighted spectacles


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