1 Refraction of Light: It has been observed since ancient times that light refracts or "bends" as it
travels from one medium to another (from air to water, for example). If V1 is the speed of light
in one medium and V2 its speed in another medium, then according to Snell's Law, *
Snell's Law: (sin01/sinO2)=(V1N2)
where 0, is the angle of incidence and 0, is the angle of re-
fraction (see the figure). The number v1/v2 is called the index
of refraction. The index of refraction for several substances is
given in the table.
If a ray of light passes through the surface of a lake at an
angle of incidence of 70°, what is the angle of refraction?

∠lno ≅ ∠lnm

∠oln ≅ ∠mln

step-by-step explanation:

given   that triangle lno is congruent to triangle lnm.

we have to fill up the blanks in the given question.

according to above order of congruency   kept in mind we can say that

∠lno ≅ ∠lnm

∠oln ≅ ∠mln

ln ≅ ln due to common in both.

hence, by sas congruency,

the side angle side rule   states that if two sides and the included angle of one triangle are congruent to another triangle, then these two triangles are congruent.

42.4

step-by-step explanation:

convert to decimal

the answer is b. 60. each interior angle in 120, so the exterior angle must be 60 in order to add up to 180

step-by-step explanation:

the radius is 2 times the diameter.

step-by-step explanation: