Physics - light topic question about refraction and reflection and stuff,...

...please help i have a test? theres a problem I'm struggling with : A frog, hiding behind a rock on the river bed can see a faint reflection of the fish in the surface of the water. as the fish swim further the refletion becomes brighter and brighter. Explain why.

I don't understand it, please please explain. I don't understand what my teacher talks about. I pay attention in class, but no matter what I do I am never able to understand physics.
 
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