Question

When measuring the thickness of a glass slab, the travelling microscope is focused on ______.

Options

• the pin placed on the glass slab

• the lower surface of the glass slab

• the upper surface of the glass slab

• the image of pin through the glass slab

Answer 1

When measuring the thickness of a glass slab, the travelling microscope is focused on the upper surface of the glass slab.

Explanation:

To measure the thickness of the glass slab using travelling microscope, the focus should be on upper surface of the glass slab.