Question
A point source of light is kept below the surface of water $n_w = \frac{4}{3}$ at a depth of $\sqrt{7}$ m. The radius of the circular bright patch of light noticed on the surface of water is ___ m.
A point source of light is kept below the surface of water $n_w = \frac{4}{3}$ at a depth of $\sqrt{7}$ m. The radius of the circular bright patch of light noticed on the surface of water is ___ m.