Light

1. Lenses - A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction.

1.1. Types

1.1.1. biconvex (convex)

1.1.2. biconcave (concave)

1.2. Types of Images

1.2.1. Virtual

1.2.2. Real

2. Mirrors - a reflective surface, now typically of glass coated with a metal amalgam, that reflects a clear image.

2.1. Types

2.1.1. Plane mirrors - This type has a flat or planar reflective surface.

2.1.2. Spherical mirrors - These can be concave/converging or convex mirrors.

2.1.3. Curved mirror - is a mirror with a curved reflecting surface. The surface may be either convex (bulging outward) or concave (bulging inward). Most curved mirrors have surfaces that are shaped like part of a sphere, but other shapes are sometimes used in optical devices.

2.2. Types of Images

2.2.1. Virtual

2.2.2. Real