00:02
In this question, we have a swimming pool and then the swimming pool is 1 .5 meter okay, then there's a 2 meter pole.
00:20
Okay, that's placed in the place particularly in the swimming pool and then sunlight is incident on the pole and an angle of 55 degrees.
00:32
Okay, so we want to find the length of the shadow of the pole on the level bottom of the pool.
00:37
Okay, so because of reflection, okay, and the light will come in like this.
00:51
Okay, so if we extend this, normal down to the bottom, okay, we see that this is the shadow of the pole that we want to find.
01:05
Okay, so it consists of here x, we call this x and this is l.
01:17
Alright, so we are given that the pole is 2 meters, so this is 0 .5 meters, so we can actually calculate x immediately.
01:32
So from diagram, 0 .5 divided by x is equal to tangent 55 degrees, so x equals to 0 .5 divided by tangent 55 degrees.
01:52
Okay, okay, then, all right, so here to find l, okay, to find out, we need the angle of incidence...