What kinds of image are formed by convex lens and concave lens ?

Image formed by convex lens are enlarged, diminished, same size, real, virtual, inverted erect etc. 

The image formed by concave lens is diminished, virtual, and erect image. 

A light ray is a line (straight or curved) that is perpendicular to the light's wavefronts; its tangent is collinear with the wave vector. Light rays in homogeneous media are straight. They bend at the interface between two dissimilar media and may be curved in a medium in which the refractive index changes.

In reflection, a light ray strikes a smooth surface, such as a mirror, and bounces off. A reflected ray always comes off the surface of a material at an angle equal to the angle at which the incoming ray hit the surface. In physics, you'll hear this called the law of reflection.Reflection is when light bounces off an object. If the surface is smooth and shiny, like glass, water or polished metal, the light will reflect at the same angle as it hit the surface. This is called specular reflection.Any mirror obeys the three laws of reflection, flat, curved, convex or concave.

The Sun casts its longest shadow when it first appears and before it disappears. When light waves hit substances, three things can happen: Light can be refracted, absorbed, or reflected. Reflection occurs when light strikes a surface and bounces off.In truth, all objects, living or inorganic are capable of absorbing light. In all cases, absorption depends on the electromagnetic frequency of the light being transmitted (i.e. the color) and the nature of the atoms of the object.The wavelength of visible light determines the color that the light appears. Light with the longest wavelength appears red, and light with the shortest wavelength appears violet. ... The wavelengths of visible light that an object reflects or transmits determine the color that the object appears to the human eye.

Coal, black paint, and carbon nanotube arrays -- also known as Vantablack -- look black because they absorb the energy of the incident light almost completely. Other materials, such as glass or quartz, have no absorbing properties and therefore look transparent.First law of reflection: According to the first law, the incident ray, reflected ray and normal, all lie in the same plane. Second law of reflection: According to the second law, the angle of reflection is always equal to the angle of incidence. ... This ray of light will be reflected back along the same path.