Question

9. A point source of light Sis placed at the bottom of a vessel
containing a liquid of refractive index 5/3. A person is
viewing the source from above the surface. There is an
opaque disc D of radius 1 cm floating on the surface of
the liquid. The centre of the disc lies vertically above the
source S. The liquid from the vessel is gradually drained
out through a tap. The maximum height of the liquid for
which the source cannot be seen at all from the above is​

Answer 1

Answer:

fix place by liquid by its temperature

Explanation: