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← ScienceWhich mechanism causes speckle patterns when laser projection occurs onto a rough wall?
A)Constructive and destructive interference✓
B)Increased photon momentum transfer
C)Chromatic aberration of the media
D)Reduced stimulated emission efficacy
💡 Explanation
Laser speckle arises from surface roughness causing variations; path differences lead to **interference**. Constructive and destructive interference causes bright and dark spots. Therefore, speckled patterns appear rather than uniform illumination because of these interference variations.
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