Gorizontga nisbatan 20° burchak ostida tushib, ko'zgudan qaytgan quyosh nurlari yordamida vertikal quduqning tubini yoritish uchun ko'zgu gorizontga qanday burchak ostida joylashtirilishi kerak?

  1. 35°
  2. 45°
  3. 55°
  4. 65°

📝 Detailed explanation

Tushish burchagi α = 20° (gorizontga nisbatan), demak normalga nisbatan tushish burchagi θ = 90° – 20° = 70°... yo'q.
Qaytish nurlari vertikal (90°) bo'lishi kerak. Tushish burchagi = qaytish burchagi.
Gorizontga nisbatan α=20° tushayotgan nur uchun: 2θ = 90° + α → θ = (90°+20°)/2 = 55°.
Ko'zgu gorizontga 55° burchak ostida joylashtirilishi kerak.
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Question 12 of 36
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