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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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