The resolution of the human eye at night is approximately 2 ‘. What will it be like when using a telescope with a lens diameter

The resolution of the human eye at night is approximately 2 ‘. What will it be like when using a telescope with a lens diameter of 8 cm and a magnification of 200x?

The simplest action is 2 arc minutes (120 ″) divided by 200, we get 0.6 ″
Now let’s compare with the Rayleigh criterion (from the previous problem)
θ = 1.22 * λ / D = 1.22 * 0.5μm / (80000μm) = 0.0000076 rad = 1.6 ″
Since this is greater than 0.6 ″, the answer is Rayleigh’s diffraction constraint: 1.6 ″

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.