Why should the cover slip be lowered onto the specimen slowly at an angle, using a mounting needle?

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Question

Why should the cover slip be lowered onto the specimen slowly at an angle, using a mounting needle?

Accepted Answer

To reduce the number of air bubbles trapped underneath it — Award 1 mark. Lowering one edge first lets the liquid spread and pushes air out ahead of it, rather than sealing air in as dropping the slip flat would.

Answer

To press the specimen hard enough to break the cell walls

Answer

To spread the stain evenly across the whole slide

Answer

To increase the total magnification of the microscope

Answer

To reduce the number of air bubbles trapped underneath it

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