Oraza de lumina cade sub un unghi de incidenta de 30 de grade pe o suprafata plana ce separa doua materiale transparente cu indicii de refractie 1,60 si 1,40.
calculati unghiul de refractie (din mediul cu indicele de refractie mai mic)

Explanation:

The question in english is:

A ray of light falls under an angle of incidence of 30 degrees on a flat surface that separates two transparent materials with index of refractions 1.60 and 1.40, respectively.

Calculate the angle of refraction (from the environment with the lower index of refraction)

According to Snell’s Law:  

(1)  

Where:  

is the first medium index  of refraction

is the second medium index  of refraction

is the angle of the incident ray  

is the angle of the refracted ray

We need to find from (1):

(2)  

(3)

Finally:

come closer and become far apart and become steam/gas

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force