Answer: -0.5 D.
- A -0.5 D
- B -1 D
- C +0.5 D
- D +1 D
Correct answer: A. -0.5 D
Explanation: Myopic eye: far point at 2 m. Concave lens diverges parallel rays to appear to come from 2 m. P = 1/f = 1/(-2) = -0.5 D.
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.