Page 250 - Physics_Form_2

Physics for Secondary Schools

Glossary

Accommodation (of the eye) is the adjustment of the focusing power of the eye
to see objects clearly over a range of distances.
Accommodation is achieved by changing the shape of
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the crystalline lens.

Angle of deviation is the angle through which the direction of a ray of light
is changed by a refracting surface of a prism. It is the
angle between the incident and refracted (or emergent)
ray.

Apical angle is an angle included between refracting surfaces and
which is contained in a principal section of a prism.
Ammeter a device for measuring electric current in a circuit. It is
calibrated in amperes (A).
Alnico is a family of iron alloys that, in addition to iron, are
composed primarily of aluminium, nickel, or cobalt.

Ampere is the SI unit of electric current and indicates the rate at
which charge flows in a circuit.

Battery is several electric cells connected to produce electric
current through converting chemical energy to
electrical energy.
Critical angle is the angle of incidence in the denser medium for
which the angle of refraction in the less dense medium
is 90°. It is the smallest angle of incidence at which
total internal reflection occurs.
Conduction electrons free electrons that can move from one atom to another
within a material.
Contact charging is the process of transferring electric charges from one
body to another by making the bodies touch each other
or by rubbing.

Coulomb is a quantity of electric charge that passes through a
given point in a circuit in one second when a steady
current of 1 ampere flows. It is the SI unit of electric
charge.

Dispersion (of white light) is the splitting of visible white light into its component
colours by a dispersive medium. This occurs because
each colour has its own frequency of dispersion.

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Student’s Book Form Two

Physics Form 2 Final.indd 244 25/10/2025 10:29