optics - How are we able to view an object in a room with bulb..?

This is a very basic question on optics. How are we able to view an object kept in a room with a bulb?

From what I understand, light rays from bulb will hit the object and some colour will be absorbed and rest will be thrown off. but how does the thrown off light reach eyes?

I thought a light ray will reflect with same angle back (as the angle between incident ray and normal) then how is it guaranteed that a reflected ray will reach eyes?

Answer

I think your illustration answers your own question fairly well. It's not guaranteed at all that a reflected ray will reach the eye however I'm sure that you can cast a ray between the light source and the eye that bounces off the object. Note that the object you have drawn has perfectly specular reflections, whereas most objects around you will have a degree of surface texture that will result in surface normals that vary wildly over small distances, resulting in a degree of lambertian reflection. In this regime, there are many different paths a photon can take between the light source and the eye. Throw in refraction, subsurface scattering and the rest and you will get a better picture of everyday environments, where light disperses and bounces around everywhere.