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IMSO 2008 Science Taiwan Second Round Theory I Question 6

IMSO Science · IMSO 2008 Science Taiwan Second Round Theory I

Question 6

Section A: choose the correct answer. The supplied key prints 2 points per question and 50 minutes. Source header says Qualifying Examinations; key says Taiwan (2).

The primary mirror in an astronomical telescope must be:
  1. half-silvered
  2. convex
  3. concave
  4. plane