3. Light rays travel from air to medium Q as shown. Refractive index of air = 1. air
45
30
Calculate the refractive index of Q.

the answer is b, have negligible mass

initial speed when it is dropped is 150 ft/s

now at the same moment the acceleration due to gravity is perpendicular to its velocity

so as we know that

now we have centripetal acceleration a = 32 ft/s^2 as its perpendicular to velocity

while tangential acceleration at the same moment will be zero

so

now radius of curvature is given as

so the radius of curvature just after it is dropped is 703.125 ft

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