44.
(a) The law of refraction requires that sin θ
1
/ sin θ
2
= n
water
= const. We can check that this is indeed
valid for any given pair of θ
1
and θ
2
. For example sin 10
◦
/ sin 8
◦
= 1.3, and sin 20
◦
/ sin 15
◦
30
= 1.3,
etc.
(b) n
water
= 1.3, as shown in part (a).