snells law. sin theta 1 over sin theta 2 equals to v1 over v 2, speed is 2.99x10^8 and angle is 87 degrees and angle of refraction is 76 degrees

Question

i need to find v2 

Answer 1

If you have everything except v₂ then write the equation, replacing every sine by the appropriate decimal value.

 

Then you have a simple proportion; cross-multiply and then solve for v, decimally. 

 

Carry all sines to at least 5 decimal places, and do all computing with no rounding.  Round off at the end, to the desired accuracy for v_2.