Estimate what size details could be observed on the surface of Mars during the great opposition of 2003 (radius of Mars 3,400 km)

Estimate what size details could be observed on the surface of Mars during the great opposition of 2003 (radius of Mars 3,400 km) with a telescope with a diameter of 200 mm.

Let us determine the theoretical resolution of the telescope: β = 1.22 * λ / D – the resolution of a telescope with a diameter D at a wavelength λ. Substituting λ = 0.55 µm (maximum eye sensitivity), we get the formula β = 140 ”/ D (students who immediately wrote this formula were not penalized). Those. for a telescope from the condition of the problem β = 0. ”7.
During the great opposition, the distance to Mars is less than 60 million km. The angular size of Mars will be 2 * 3400/60000000 * 206265 = 24 ”(students who immediately wrote this value were not fined).
The linear size on Mars, corresponding to the resolution of the telescope (0. ”7) – 0.7 / 24 * 6800≈200 km. Details of this size were observed to the limit on the surface of Mars in August 2003 with a 200 mm telescope (often the atmosphere limits the resolution to 1–2 ”).

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.