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## Homework Statement

Two point sources of light are separated by 4.91 cm. As viewed through a 12.1 μm diameter pinhole, what is the maximum distance from which they can be resolved if red light (λ = 690 nm) is used?

## Homework Equations

sinθ = 1.22*(λ/D)

y= L*tan θ

## The Attempt at a Solution

Using sinθ = 1.22*(λ/D) , I solve for θ. Then using θ I put it into the second equation,

y= L*tan θ.

I should then be able to solve for L, but the problem is i don't know what y is, or what value i can use for y. Any suggestions? Thanks in advance