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← ScienceWhich mechanism causes increased speckle contrast when imaging biological tissue with a coherent laser?
A)Constructive and destructive light interference✓
B)Diffraction around cellular structures
C)Increased numerical aperture reduction
D)Material stimulated Brillouin scattering
💡 Explanation
Speckle arises from surfaces that are rough compared to the wavelength and is caused by light interference within coherent beams; because various path lengths sum constructively or destructively it leads to bright and dark spots, therefore speckle contrast increases rather than decreases under these conditions due to the distribution of wavefronts scattering.
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