Could i get some help, thanks.

Question 1 A circular aperture is lit up by a laser with wavelength 573 nm. The central maximum on the screen 37.0 cm away has the same diameter as the circular aperture. What is the diameter of the circular aperture? Question 2 A 1.40-cm-tall candle flame is 4.40 m from a wall. You happen to have a lens with a focal length of 33.0 cm, and notice while playing around with it that there are two locations you can place the lens and form a well-focused image of the candle flame on the wall. What is the distance between these two lens locations