Alight ray in air is incident on a transparent material whose index of refraction is t. o. find an expression for the (non-zero) angle of incidence whose angle of refraction is half the angle of incidence. b. evaluate your expression for light incident on glass.

Explanation:

Refractive index f the medium, n = t

Let the angle of incidence is i

(a) As given in the question, the angle of refraction is half of angle of incidence.

Let the angle of refraction is r

r = i / 2

By use of Snell's law

By substituting the values, we get

By using the formula of trigonometry

Sin2Ф = 2 SinФ CosФ

So,

(b) For glass, the value of refractive index is 1.5, so the above expression becomes

i = 82.8°

what type of charge does it have? negative

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.