A point source of light is placed at the bottom of a vessel containing a liquid of…
PHYSICS · Subjective · CBSE · Physics · Ray Optics and Optical Instruments · Ray Optics and Optical Instruments
Problem
A point source of light S is placed at the bottom of a vessel containing a liquid of refractive index 35. A person views the source from above the surface. An opaque disc of radius 1 cm floats on the surface, with its centre vertically above S. The liquid is gradually drained through a tap. What is the maximum height of liquid for which the source cannot be seen from above?