Which mechanism limits focal spot size inside photorefractive keratectomy?

💡 Explanation

Diffraction fundamentally limits resolution because shorter wavelengths diverge less during focusing; therefore, the laser cannot be focused beyond the diffraction limit, rather than being limited by aberration under ideal conditions, or thermal blooming at lower incident powers.

• Which consequence results when van der Waals forces weaken in molecular packing?
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• Which outcome occurs when a voltage spike exceeds ceramic capacitor's dielectric strength?
• Which outcome occurs when a rapidly switched inductive load is connected to a long, unterminated electrical cable acting as a capacitor?
• Which risk increases when ground conductivity decreases substantially along a buried high-voltage power transmission line?
• Which mechanism causes filamentation during ultrashort laser pulse propagation?