The core of an optical fiber has an index of refraction of 1.33 , while the index of refraction of the cladding surrounding the core is 1.15 . What is the critical angle θc for total internal reflection at the core‑cladding interface?

when jerome paddle in flowing river towards east the net speed of jerome will increase

so the net speed of jerome will be given as

now the speed of paul will be same as it is given as he is running on the ground

so

so here we can say since the speed of jerome is more so he will win the race

now as we know the distance so the time difference is given as

so jerome will reach first and the time difference will be 203.55 s or 3.4 min

false.

explanation:

this statement is false. after falling for 5 seconds, its speed will not be 100 m/s.