Question

# A point source of light *S* is 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 above is

- 1.50
*cm*
- 1.64
*cm*
- 1.33
*cm*
- 1.86
*cm*

*cm**cm**cm**cm*## The correct answer is: 1.33 *cm*

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