Answer: d/n.
- A nd
- B d/n
- C d x n<sup>2</sup>
- D d/(n<sup>2</sup>)
Correct answer: B. d/n
Explanation: Apparent depth = real depth / refractive index = d/n. Objects appear shallower when viewed from above.

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.