Answer:
(b) 32.2°
Explanation:
Using Snell's law as:
Where,
is the angle of incidence ( 30.0° )
is the angle of refraction ( ? )
is the refractive index of the refraction medium (Material B, n=5 / 4)
is the refractive index of the incidence medium (Material A, n=4 / 3)
Hence,
Angle of refraction = 
= 32.2°
Answer:
Energy is stored in the bonds between atoms
30
Hope you do well on the test and hope this helps!
