Question

1.Light with a wavelength of 626 nm passes through a slit 7.74 μm wide and falls on a screen 1.75 m away. Find the linear distance on the screen from the central bright fringe to the first bright fringe above it._________cm

2. A 2.05-cm-tall object is placed 30.0 cm to the left of a converging lens with a focal length f1 = 21.0 cm . A diverging lens, with a focal length f2 = -42.5 cm , is placed 30.0 cm to the right of the first lens. How tall is the final image of the object?________cm

Answer 1

The exact solution is

y = D*tan(theta)

= 0.572974 m, where theta = arcsin(m*lambda/a) =arcsin(1*626*10^-9/7.74*10^-6)= 0.08087 rad.

solution is y = D*tan(theta)

=1.75*tan(0.08087)

= 0.02470 m

2)