Question

મેગ્નેશિયમ પટ્ટી ને હવા માં ચ સળગાવતા પેહલા શા માટે સાફ કરવા માં આવે છે​

Answer 1

Answer:

the fact or phenomenon of light, radio waves, etc. being deflected in passing obliquely through the interface between one medium and another or through a medium of varying density.

change in direction of propagation of any wave as a result of its travelling at different speeds at different points along the wave front.

measurement of the focusing characteristics of an eye or eyes.