# astronomy

posted by Titos

In space, the angular resolution of the Keck telescope is govererned by the diffraction limit.

How far away could you read the same book, using the Keck telescope in space? Please express your answers in units of meters.

1. Anony

Diameter of keck telescope, D= 10m and let Wavelength, λ = 5*10-7 m
θ = Angular diffraction = 1.22(λ/D) = 6.1*10-8
s = r*θ (where θ=6.1*10-8 and s=3*10-3 m)
r= 49180.32 m

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