The diameter of the objective lens of a small telescope is 63 mm. Determine the wavelength of light passing through the telescope if the resolution is 9.2 ×10−6 radians
Question
The diameter of the objective lens of a small telescope is 63 mm. Determine the wavelength of light passing through the telescope if the resolution is 9.2 ×10−6 radians
Solution
The resolution of a telescope can be calculated using the formula:
θ = 1.22 * (λ/D)
where: θ is the resolution in radians, λ is the wavelength of light, and D is the diameter of the objective lens.
In this case, we know the resolution (θ = 9.2 ×10−6 radians) and the diameter of the objective lens (D = 63 mm = 0.063 m), and we want to find the wavelength of light (λ).
Rearranging the formula to solve for λ gives:
λ = θ * D / 1.22
Substituting the known values gives:
λ = 9.2 ×10−6 * 0.063 / 1.22
Calculating this gives:
λ = 4.77 ×10−7 m, or 477 nm.
So, the wavelength of light passing through the telescope is approximately 477 nm.
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