θ1. The problem statement, all variables and given/known data The sun of (diameter D) subtends an angle of θ radians at the pole of the concave mirror of focal length f. The diameter of the image of the sun formed by mirror is _____ 2. Relevant equations 1/v+1/u=1/f 3. The attempt at a solution confused with question. Either i am getting zero or infinity(sun is too large!)..