The slide & film both are fuzzy. How do I play them

Hint 1 of 5:

What do you do when you get a fuzzy picture?

Hint 2 of 5:

Focus it. You can only focus the slide projector.

Hint 3 of 5:

You now need to do 2 things at once.

Hint 4 of 5:

Play the film together with the slide.

Hint 5 of 5:

Look at the screen. Do what it tells you.