Please solve question 4

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Hi please bear with me as the question is not so visible to read. Any way this is the question asked by our friend. Just an eye at the bottom of a lake of depth h can see only through a circular part of radius R and other region just like a mirror. We have to find R in terms of h and refractive index of the liquid (water)
Here it is if possible please share with that friend
Thanks in advance
Hello Neelima dear, here is the answer for your query

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