Under what conditions does light experience Blueshift?
Answer
When a light source is moving toward an observer, causing the light waves to be compressed.
Blueshift is the opposite phenomenon of Redshift. It occurs when the source of light is actively moving toward an observer. As the source approaches, the emitted light waves are compressed, which results in higher frequency waves. On the visible light spectrum, this compression shifts the light toward the blue end. This is the inverse of the redshift effect, where waves are stretched when a source moves away.
#Videos
GCSE Physics - What is Red Shift? (2026/27 exams) - YouTube
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