Which experiment would be BEST to investigate the effects of wavelength on diffraction patterns?
A) Send pulses down a slinky at a variety of wavelengths and measure the reflected amplitudes.
B) Strike tuning forks of various frequencies and observe the beat frequencies that are created.
C) Shine lasers of various colors at a narrow slit in an index card and measure the distance between the bright spots.
D) Emit sound waves from a car moving at a variety of speeds and listen to the pitch of the sound as it moves towards and past.

When the light passes through the narrow opening or the obstacles, it bends. This process is called the diffraction of light. The experiment to investigate the wavelength on the diffraction pattern is " to find the wavelength of laser light with the help of diffraction process ".

In this experiment, a laser light, a slit and the detector is placed on the optical bench. Then the laser light is passes on the slit and diffraction pattern can be seen in the screen.

So, the correct option that shows the best experiment to investigate the wavelength on the diffraction pattern is " Shine lasers of various colors at a narrow slit in an index card and measure the distance between the bright spots ".