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A double slit slide is labeled a=0.04 mm and d=0.25 mm. If the slide is 490...

A double slit slide is labeled a=0.04 mm and d=0.25 mm. If the slide is 490 mm from the screen and the m=3 interference fringe is 28 mm from the m=0 fringe, what are the measured values for y3, theta3, and lambda?

I don't have a figure.. It says to use equations y = L tan theta and delta r = d sin thetam = m lambda

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