Question

What appears when the slit is aligned parallel to the filament?

Options

• An indistinct pattern that disappears

• Clear, bright, and dark bands (fringes)

• Only a wider fringe pattern

• Only a narrower fringe pattern

Answer 1

Parallel alignment produces clear, bright, and dark bands called fringes. Keeping the slit parallel to the filament is important for seeing the pattern distinctly.