a) If light with a wavelength of 477 nm was used, how far away was the screen in metres? b) Also, find the angle made to the 3rd bright spot to the left of the central maximum. Include a sketch.

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Light hits a double slit, with a spacing of 178 μm. The 2nd dark spot is located exactly 7.78 cm from the central maximum.

a) If light with a wavelength of 477 nm was used, how far away was the screen in metres?

b) Also, find the angle made to the 3rd bright spot to the left of the central maximum. Include a sketch.

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