What is the refractive index of a medium when the light strikes the medium after traveling through air at an angle of 23.3° and the refracted angle is 14.6°?
1.33
1.36
1.44
1.57
1.91

The refractive index of the medium is 1.57

Explanation:

It is given that,

Angle at which the light strikes the medium after travelling through air, i = 23.3°

Angle at which the light ray is refracted, r = 14.6°

Snell's law gives the relation between the angle of incidence, angle of refraction and refractive index. Mathematically, it is given by ;

n = 1.569

or

n = 1.57

So, the refractive index of the medium is 1.57. Hence, this is the required solution.

emily ruth's annual premium is $1058.50

step-by-step explanation:

emily ruth is a female of 27 years age purchasing 20 year endowment insurance with face value $25000.

from the given table,

for females, the age of a male 3 years younger should be used.

so, we have to check for 24 year male for 20 year endowment.

it is 42.34 for every $1000 face value.

for a face value of $25000,

it is 25 * 42.34 = $1058.50

∴ emily ruth's annual premium is $1058.50