Young's Double Slit Experiment & Diffraction Grating Formula

Draw a diagram of Young’s Double Slit Experiment

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Explain this experiment

Young shone light at a double slit. This produced a series of alternating dark lines and bright lines on a screen. This was the first proof that light was a wave

Draw a diagram of The Diffraction Grating Formula

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What is the Diffraction Grating Formula?

nλ = dSinθ

Derive the diffraction grating formula

Sinθ = opp/hyp = |CB|/|AC| but |AC|=d

⇒ Sinθ =|CB|/d

⇒ |CB| = dSinθ

⇒ For constructive interference to occur |CB| = nλ where n = 0 1 2 3 etc.

∴nλ = dSinθ

What does n stand for ( Diffraction Grating Formula)?

Order of image

What does λ stand for ( Diffraction Grating Formula)?

Wave length

What does d stand for ( Diffraction Grating Formula)?

Slit separation

What does θ stand for ( Diffraction Grating Formula)?

Angle