Question

what is that triangle made by a glass when it reflects it throws 7 colours which 7 colours are they and what that object called​

Answer 1

$\bold\green{Answer :-}$

Refraction of light through a glass prism

Refraction is the bending of light when it goes from one medium to another so, when a ray of light passes through a glass prism, refraction of light occurs both, when it enters the prism as well as when it leaves the prism. Since the refracting surfaces are not parallel, therefore, the emergent ray and incident ray are not parallel to one another. In this case the ray of light is deviated on passing through the prism.