The critical angle for total internal reflection for cubic zirconia surrounded by air is 27.0°. calculate the polarizing angle for cubic zirconia.

Polarizing angle,

Given:

Critical angle,

Solution:

Now, in Total Internal Reflection (TIR), the critical angle for cubic zirconia is given by:

                     (1)

where

= refractive index of zirconia

From eqn (1):

Now, the angle of polarization is given by:

tan

Therefore,

5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form