I have came across a java code in which I have seen passing this as a parameter of constructor?

Question

What actually this referencing?
Like
Class Ray{
Smit s = new Smit(this);
}

Answer 1

Is it true that if I want to create obj of Smit class from another class that another class must extends Smit class? For working of Smit(this) signature constructor?

Answer 2

I know that but passing in this way means what exactly this is referencing here?

Answer 3

Can you check one code for me please?

Answer 4

https://code.sololearn.com/cWC3NP9rJ5Jb/?ref=app