Optical Filters
Electromagnetic spectrum covers many wavelength regions from Gamma ray, X ray, ultraviolet (UV), visible light, infrared (IR) to radio wave. Visible light is the portion of the electromagnetic spectrum that
Lesson 9 – Light Waves
In “What is Light?”, we described light as both a wave and a particle under the conditions of the wave-particle duality. In the previous posts, we have mostly modeled light
Lesson 8 – Prisms and Total Internal Reflection
Besides lenses and mirrors, prisms are another group of common optical elements. White light that enters a prism leaves as many different colors due to the different refractive indexes of
Lesson 7 – The Eyepiece and Lens Requirements
In the previous post, we looked at how changing the focal lengths produced different images (and virtual images) for SINGLE lenses. Sometimes, however, a system of lenses is needed to
Lesson 6 – Focal Length and Applications of Lenses
Focal length is important not just in terms of positive and negative. For convex lenses, different focal lengths can have drastically different images. If an object (u) is at a
