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Which types of lasers are used in optical tweezers?

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Which types of lasers are used in optical tweezers?

(a) Laser beams

(b) UV-rays

(c) X-rays

(d) Radio waves

This question was posed to me in homework.

My doubt stems from Studying the Cytoskeleton in portion Cytoskeleton and Cell Motility of Cell Biology

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Right answer is (a) Laser beams

Explanation: Microscopic beads attached to specific proteins can be placed directly on a specific cell organelle using laser beams. This grasps microscopic objects and is referred to as optical tweezers.

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