Question

What should be done while slowly adjusting the width of the slit?

Options

• Make the pattern indistinct

• Use a red colour filter, then a blue colour filter

• Keep it parallel to the filament

• Keep it not parallel to the filament

Answer 1

The gap between the blades is adjusted slowly while the slit remains parallel to the filament. Changing the width without changing the alignment lets the bands be observed clearly.