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IQScience

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## Homework Statement

Hey everyone. Just as a preface so you all know, I'm in England studying AQA Physics A.

I'm currently studying the optional astrophysics module.

I have a problem - in all the textbooks and revision guides I have, there is a topic on diffraction of light through a grating (Unit 2 topic), and there's a topic in my Collins Unit 5 textbook on resolving power of telescopes (Unit 5 optional topic astrophysics).First of all, in the Unit 2 diffraction topic, it states that for light being diffracted, the equation for finding the

**maxima**is given by sinθ = nλ/d (where n = a whole number (integer)).

However, in the Unit 5 astrophysics resolving power of telescopes topic, it states that for light being diffracted (and forming an Airy disc), the equation for finding the

**minima**is given by sinθ = nλ/d (where n = a whole number (integer)).

I'm really confused here, because both are examples of light diffraction and I have no idea whatsoever why the same equation has been used to describe the locations of maxima and minima. It just doesn't make sense.

Help pls?

edit: I should note that in the equation, d = mirror diameter (telescopes) or distance from grating to screen (gratings).