Discussion
Which of the following properties of light can be used to explain the phenomenon of shadow formation ?
A. Light travels in a straight line.
B. Light travels at a high speed.
C. Light is composed of seven colours.
D. Light does not pass through opaque objects.
Answer: D
The properties that explain shadows are D and A.
A shadow forms because light travels in straight lines (A) and cannot pass through an opaque object (D). The object blocks the straight rays, and the region behind it that the rays cannot reach is dark.
The high speed of light (B) and its being composed of seven colours (C) are true facts but play no part in shadow formation, so every option that includes B or C is wrong.
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