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PHYSICS

Chapter 1 Measurements

http://en.wikipedia.org/wiki/SI_prefix







Chapter 3 & 4

Weight : Spring Balance : N
Mass : Electronic Balance : kg

Inertia of an object refers to the releuctance of the object
to change its state of rest or motion.

Density of a substance is defined as its mass per unit volume.
SI unit is : kg/m³


Chapter 12 Light

Laws of Reflection

First Law of Reflection:
The incident ray, reflected ray and the normal to the reflecting surface
all lie in the same plane.

Second Law of Reflection:
The angle of incidence is equal to the angle of reflection. (i.e i = r )

Laws of Refraction

1. The incident ray, the normal and the refracted ray all lie in the same plane.
2. For two particular media, the ratio of the sine of the angle of incidence
to the sine of the angle of refraction is a constant

i.e sin i / sin r = constant


Speed of Light and refractive index

Refractive index of a medium = c / v

sin i / sin r = n = c / v


Total Internal Reflection

Critical Angle

Critical angle is defined as the angle of incidence in the
optically denser medium for which the angle of refraction
in the less dense medium is 90°

Total Internal Reflection takes place only when
1. a ray of light travels from a optically denser to a less dense
medium, and
2. the angle of incidence in the optically denser medium is greater
than the critical angle.

angle i = angle c and angle r = 90°

n = sin 90° / sin c
n = 1 / sin c
sin c = 1 / n

Labels: critical angle, inertia, internal reflection, Measurements, Physics, prefixes, reflection, refraction

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February 2008

• Social Studies: CT Review 1
• History: CT Review 1 (Treaty of Versailles)
• Chemistry Review for CT1
• Physics Review for CT1
• Biology Chapter 2 - Cells

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