Lambert's law of radiation on optical base plate

Principle

Visible light impinges on a diffusely reflecting surface. The luminance of this surface is determined as a function of the angle of observation.

Benefits

• Study the light intensity that a sheet of paper is diffusely reflecting
• Learn about the different physical units associated with light
• Very versatile optical base plate

Tasks

1. The luminous flux emitted reflected by a diffusely reflecting surface is to be determined as a function of the angle of observation.
2. Lambert's law (cos-law) is to be verified using the graph of the measurement values.

Learning objectives

• Luminous flux
• Light quantity
• Light intensity
• Illuminance
• Luminance