The angular resolution limit for two-point sources of light with equal intensity:

$\overline{){\mathbf{\u2206}}{\mathbf{\theta}}{\mathbf{=}}\frac{\mathbf{1}\mathbf{.}\mathbf{22}\mathbf{\lambda}}{\mathbf{D}}}$, where D is the aperture diameter and Δθ is in radians.

Two light bulbs are 2.0 m apart.

From what distance can these light bulbs be marginally resolved by a small telescope with a 5.0 cm-diameter objective lens? Assume that the lens is limited only by diffraction and λ = 600 nm.

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