Answer: +0.5.
- A +0.5
- B +1
- C -0.5
- D -1
Correct answer: A. +0.5
Explanation: For convex mirror: f=+20, u=-20. 1/v = 1/f - 1/u = 1/20 - 1/(-20) = 1/20+1/20 = 2/20. v=+10. m = -v/u = -10/(-20) = +0.5.
Concave mirror ray construction: a ray parallel to the axis reflects through F, and a ray through F reflects parallel, locating the inverted real image. Image: Maxmath12, CC0, via Wikimedia Commons.
Concept context
Reflection, refraction, lenses, mirrors, total internal reflection.