Radiation pressure

This article provides answers to the following questions, among others:

  • What is radiation pressure?
  • What are photons?
  • How is the radiation pressure calculated?
  • What is the relationship between radiation pressure and energy density?
Continue reading Radiation pressure

Interaction of Radiation with Matter

This article provides answers to the following questions, among others:

  • What is absorption, transmission and reflection?
  • Why are the facades of houses white in hot regions?
  • Why is a ray of light refracted when it hits a optically permeable medium?
  • Why do you see objects through a window glass with a slight displacement?
  • What is specular and diffuse reflection?
  • Why does one not get sunburn through a window glass?
  • On what does the ability of an object to absorb, transmit and reflect depend?
Continue reading Interaction of Radiation with Matter

Color vision

This article provides answers to the following questions, among others:

  • In what wavelength range is radiation visible to the human eye?
  • Which three types of receptors are responsible for perceiving colors?
  • How can the human eye perceive so many different colors with only three receptor types?
  • Which receptor type is responsible for light-dark perception?
  • Of which wavelengths does white light consist?
  • How are colors of objects formed?
  • What are complementary colors and how are they formed?
Continue reading Color vision