Saved Bookmarks
| 1. |
An observer can see through a pin-hole at the top end of a thin rid of height h, placed as shown in figure. The beaker height is 3h and its radius is h. When the beaker is filled with a liquid upto a height 2h, he can see the lower end of the rod. Find the refractive index of the liquid. |
|
Answer» SOLUTION :`PQ =QR =2h` ` therefore(2525)i=45^@` `thereforeST =RT=h=KM=MN` so` KS= sqrt(h^2 +(2h)^2)=hsqrt(5)` ` thereforesinr = (h)/(h sqrt(5))=(1)/(sqrt(5))` ` thereforemu = (sin i)/( sin r ) = ( sin 45^@ )/( 1//sqrt(5))=sqrt((5)/(2))` |
|