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Question: 

Two stars 18 light-years away are barely resolved by a 66-cm (mirror diameter) telescope. How far apart are the stars? Assume $\lambda$ = 550 nm and that the resolution is limited by diffraction.

Source: Giancoli, Douglas C., Physics: Principles with Applications, 7th Edition, 2014.

Quick Answer: 

$1.7 \times 10^{11} \textrm{ m}$

Giancoli 7th Edition, Chapter 25, Problem 55

(1:22)

Chapter 25, Problem 55 is solved.

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Comments

Correct me if I am wrong but doing this math out I got 1.7*10^12. I am not sure what the issue is.

Never mind I wrote 181 light years not 18. sorry!

No need to apologize ljn8, we all make mistakes.

Cheers,
Mr. Dychko