Page 131 - Physics_Form_2

Nature and reflection of light

from the Sun (solar energy) and others are non-luminous and only reflect
convert it into electrical energy. or scatter light from other sources.
4. Light travels in a vacuum. Light Bioluminescence is a natural occurrence
does not require a material medium in certain glowing organisms, especially
to travel. in dark forest settings.
FOR ONLINE READING ONLY
5. Light travels at the speed of
3 ×10 m/s, which is the highest speed Task 4.1
8
recorded on Earth. (a) Classify objects from Table 4.1 as

natural or artificial light sources.
Sources of light (b) Identify objects which emit their
Light sources can be classified into own light (luminous) and those
two main types: natural and artificial. which do not emit light (non-
Some objects are luminous, meaning luminous).
they produce their own light, whereas

Table 4.1: Natural and artificial luminous and non-luminous objects

(a) Uhuru torch (b) The Sun (c) Lamp (d) Match box

(e) Fire (f) Light bulb (g) Plane mirror (h) Lightning

(i) TV screen (j) Bioluminescence
eyes (k) Volcano (l) Firefly

125

Physics Form 2 Final.indd 125 25/10/2025 10:27