0:00
So this is a scenario.
00:01
Now, say at this point a, the beam is hitting and it is making angle theta as per the law of reflection.
00:09
This would be angle reflector is also theta.
00:12
So from triangle a, o b, and this is a c, d.
00:16
From tangle aob, b, we can say that tan theta is equal to oa divide by ob that means w minus x divided by h and triangle ac cd we can say that tan theta is equals to x divided by 2 or 2 x by h so if we just equate both of these equation we get w minus x divided by h is equal to 2 x divided by h or we can say that x equals to w divided by 3 okay we have given that w the width of the wall is 4 .0.
00:58
Right so it would be 4 .8 divided by 3 and that means x is equal to 1 .6 meters so now from triangle say this is n now from triangle triangle a b n we can say that 10 5 is equal h divided by w minus x that means we have given that height is what height is going to 2 .3 so 2 .3 divided by w my sh means 4 .8 minus 1 .6.
01:37
So let's find this value.
01:39
The ratio would be equal to what? 2 .3 divided by 4 .8, 4 .8 minus 1 .6...