Question

Review Part A A diffraction grating has 2600 lines/cm What is the angle between the first-order maxima for red light (λ-680 nm) and blue light(λ: 410 nm)? Express your answer to two significant figures. ΑΣφ Next Item 四! red blue Submit Request Answer

Answer 1

Solution)

For red light,

Diffraction angle, theta red= arc sin(m*lambda/d)

= arc sin(1*(680*10^-9 m)/(1/2600)*10^-2)

=10.18 degrees

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For blue light,

Theta blue= arc sin(1*(410*10^-9)/(1/2600)*10^-2)

=6.11 degrees

Now, delta theta=10.18-6.11= 4.06 degrees

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