How could you increase the width (in centimeters) of the central maximum of the diffraction pattern on the screen? There may be more than one correct method, so select all those that would work. In each case, assume you only do the one named thing and make no other changes.

1) use of light with longer wavelenght will increase the width of the central maxima

2) increasing the number of slit will increase the width of the central maxima

3) narrowing the slit will increase the central maxima.

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

hope this ! : )