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When we say "with respect to”. Like a with respect to b then what do we have to do? a-b or b-a or b/a please help . (While finding relative refractive index, etc)

When we say "with respect to”. Like a with respect to b then what do we have to do? a-b or b-a or b/a please help . (While finding relative refractive index, etc) 
 

Grade:11

3 Answers

Umakant biswal
5349 Points
7 years ago
@ siddhi 
thats a good question . 
absolute refractive index can be measured only by ratio , of the two diffrent medium to be considered . 
for example – refractive index of medium 2 with respect to medium 1 will be given as 
u2/u1 = c/v2 / c/v1 = v1/v2 
so, obviously it will be a/b 
HOPE IT CLEARS NOW . 
ALL THE BEST ..
Siddhi
11 Points
7 years ago
@ umakant biswal then in velocitys (of two trains when going in same direction or opp) why do we subtract or add. There also it is “with respect to"
 
Umakant biswal
5349 Points
7 years ago
@ siddhi 
that is relative velocity and here it is optical part , both are opposite of each other . 
and their we take that with respect to ground and ground is a frame of reference or stationary point . 
here we are taking 2 medium in concept and here no point works as frame of reference . 
HOPE IT CLEARS NOW ..

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