Young's Double Slit Experiment

Question 1

Young’s Double Slit Experiment

Answer 1

• Experiment with the interference from two monochromatic coherent source
• Monochromatic is light with the same wavelength

Question 2

Procedure

Answer 2

• To observe interference between two waves, we need two coherent sources
• To make the coherent we use a laser that produces monochromatic, coherent light
• Two slits then act like two identical source sluts must be the same size and similar to the wavelength
• This produces a series of light and dark fringes corresponding to constructive and destructive interference
• Bright fringes = constructive interference
• Dark fringes = destructive interference

Question 3

Why use laser light?

Answer 3

• Monochromatic and coherent
• So it the waves are in phase and have the same frequency while having the same wavelength
• If the wavelength is similar to the width of one slit the diffraction pattern is more clearer

Question 4

Wavelength effect

Answer 4

• If you increase wavelength of the incident light the width of central maximum will increase as it will increase diffraction

Question 5

Slit width effect

Answer 5

• If you increase slit width the width of the central maximum will increase as it will decrease diffraction