Which of the following relations correctly links real depth

PHYSICS · Single correct · CBSE · Physics · Light — Reflection and Refraction · Light — Reflection and Refraction

Problem

D

, apparent depth

d

and refractive index

n

of water when the object is viewed vertically from air? (a)

n = \sqrt{\dfrac{D}{d}}

(b)

n = \dfrac{D+d}{d}

(c)

n = \dfrac{D}{d}

(d)

n = \dfrac{D}{D-d}