Please solve attached Question.
Q. A circular disc of diameter d lies horizontally inside a metallic hemispherical bowl of radius 'a'. The disc is just visible to an eye looking over the edge. The bowl is now filled with a liquid of refractive index . Now, the whole of the disc is just visible to the eye in the same position. Show that
![](https://s3mn.mnimgs.com/img/shared/content_ck_images/ck_5af106e052596.png)