Physics · Illumination
What is the primary purpose of the outer glass cover in a mercury vapour lamp?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1To increase the overall luminous efficacy of the lamp
- 2To absorb harmful ultraviolet radiations and protect the inner arc tube from temperature variations✓
- 3To diffuse light uniformly in all directions
- 4To protect the lamp from high voltage electrical surges
Correct answer
To absorb harmful ultraviolet radiations and protect the inner arc tube from temperature variations
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