00:02
In this problem, first of all, we need to understand the rules of ray pattern to be followed for ray diagram of concave lens.
00:12
So first of all, ray parallel to principle axis, right? so here is the concave lens, right? and this is the diagram.
00:33
This is the focus.
00:40
And we have ray like this.
00:44
So ray is basically here parallel to the principal axis.
00:49
So this is the principal axis, right? and this is the focus.
00:55
I'm sorry, i should try it.
00:56
I should extend this up to this.
01:00
This must be extended like this.
01:02
Okay.
01:03
So this is first thing, right? so this appears to diverge from principle focus.
01:24
Right so this is first condition now our second case would be the ray passing through principal focus right so here there will be lens and this is principal axis so now this is basically the diagram would be like this right and the focus will be here right so this means that parallel to this is this ray is parallel to principle axis is it now if you look forward for the third condition what could be the third condition third condition would be through optical center right so here this moves like this optical center so this is the center so this is the center so here no refraction is seen without deviation, you can say.
03:19
So this is what the three concepts we have for conclave lens.
03:25
Now we will see here.
03:27
So here for the first one you can see...