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a) Imagine that you are conducting an activity with a laser to create an interference

pattern. Use the

appropriate equations to predict two ways (other than the way

described in the following example) to change the interference pattern in order to

have closer fringes. Explain your predictions.Here's an example to get you started:

According to the equation

Δx = Lλ /d

,

the distance between the fringes (Δx) is proportional to the wavelength (since

they are both numerators). This means that increasing one will increase the other.

Therefore, decreasing the wavelength will decrease the distance between the fringes.

(Hint: You can use the "Thomas Young's Double-slit Experiment" simulation from

this lesson to verify your predictions.)

b) If you were using a hands-on activity to verify your predictions and use

measurements to determine the wavelength of the laser being used, describe any

safety precautions you would take and sources of error that you might encounter. Be

sure to explain how you might reduce the effects of the sources of error.

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