Question

A telescope has an objective of diameter 2.5 m. What is its angular resolution when observed at 7500 Å?

Answer 1

Given:

a = 2.5 m

λ = 7500 Å

λ = 7.5 × 10⁻⁷ m

Formula:

dθ = `(1.22  lambda)/"a"`

= `(1.22 xx 7.5 xx 10^-7)/2.5`

= 1.22 × 3 × 10⁻⁷

= 3.66 × 10⁻⁷rad

Thus, the angular resolution is 3.66 × 10⁻⁷rad