A ray of light hits the surface between air and an unknown material at an angle A of 41.1°. It travels through the unknown material at an angle B of 27.7° relative to the vertical. What is the index of refraction of the material?

Refractive index of second material will be 1.41

Explanation:

It is given refractive index of first material, that is air

Angle of incidence = 41.1°

Angle of refraction from second material = 27.7°

We have to find the refractive index of second material.

Now from Snell's law

So refractive index of second material will be equal to 1.4

ice to water 1 water to vapour 2 latent heat

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.