Core Practical: Drawing specimen from microscope (Edexcel GCSE Biology): Quizzes

How well a microscope distinguishes 2 points close together

$400\times$

Some stains may be harmful if mishandled

So they are easier to see

Lowest-powered objective lens

Smooth lines without shading

To measure the size of cells

To calibrate the eyepiece graticule

$40$ $\mu m$

At an angle then carefully lowered

Broad view of tissue & general arrangement

Helps others understand specimen size