Telescope characteristics and radio astronomy
Answers are for parents and teachers.
1
F = 1000 mm, f = 25 mm. Γ = ?
40
2
D = 105 mm, pupil 7 mm. (105 : 7)² = ?
225
3
For D = 70 mm the resolution: 140″ : 70 = ?
2
4
Why is a radio telescope’s resolution worse than an optical one of the same D?
θ ≈ λ / D and the radio wavelength is hundreds of thousands of times larger.
5
What does the marking 10 × 50 on binoculars mean?
It magnifies 10 times; the objective is 50 mm across.