4 Match the following.
a. Opaque object i. The innermost
part of a
shadow
b. Firefly
ii. The outermost part
of a shadow
c. Umbra
iii. Bioluminescence
d. Penumbra iv. Dim shadow
e. Translucent V. Dark shadow
object
Answers
Moon Opaque Non-Luminous
Firefly Opaque Luminous
Sun Opaque Luminous
Kerosene Stove Opaque Luminous
A wire mesh – Non-Luminous
A sheet of cellophane Transparent Non-Luminous
A lighted torch Opaque Luminous
A sheet of cardboard Opaque Non-Luminous
The flame of a gas burner Opaque Luminous
A sheet of carbon paper Opaque Non-Luminous
A wall Opaque Non-Luminous
A lighted fluorescent tube Opaque Luminous
An umbrella Opaque Non-Luminous
A piece of red hot iron Opaque Luminous
A sheet of plane glass Transparent Non-Luminous
Fog Translucent Non-Luminous
Smoke Translucent Non-Luminous
A CD Opaque Non-Luminous
A sheet of polythene Translucent Non-Luminous
A wooden Board Opaque Non-Luminous
A mirror Opaque Non-Luminous
A sheet of aluminium Opaque Non-Luminous
A piece if rock Opaque Non-Luminous
Water Transparent Non-Luminous
Air Transparent
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