Answer: Bifocal lens (concave for near, convex for far).
- A Concave lens
- B Convex lens for far vision
- C Bifocal lens (concave for far, convex for near)
- D Bifocal lens (concave for near, convex for far)
Correct answer: D. Bifocal lens (concave for near, convex for far)
Explanation: Presbyopia: loss of near vision (need convex lens for reading) and possible far vision issues. Bifocals help both.
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.