incident light angle brightness

pikapika!

when light hits a surface at an angle. it is darker if it hits it at higher angle(facing away) than at a lower angle(facing towards). 1

Is there a formula for the brightness.The relationship of angle to brightness does not look linear.

http://www.vam.ac.uk/vastatic/micros...w/?movie=light1

Meir Achuz

The brightness would go like cos of the angle.

cesiumfrog

Is this only because the greater the angle, the greater the surface area that the beam interacts with? Or are there other factors?

Meir Achuz

It is just that Intensity = Power/area

robphy

There is also an inverse-square dependence, which is negligible if (for example) a point-like source is very far from the surface.

Similar Threads for: incident light angle brightness
Thread	Forum	Replies
wavelenght of the incident light	Introductory Physics Homework	5
Problem involving slits, diffraction, and incident angle.	Introductory Physics Homework	1
Does perpendicular incident light slow down through glass?	General Physics	17
Solar Cells... incident angle of radiation.	General Physics	1
Angle of Incident Problem	Introductory Physics Homework	1

pikapika!	incident light angle brightness Tweet when light hits a surface at an angle. it is darker if it hits it at higher angle(facing away) than at a lower angle(facing towards). 1 Is there a formula for the brightness.The relationship of angle to brightness does not look linear. http://www.vam.ac.uk/vastatic/micros...w/?movie=light1

Meir Achuz Recognitions: Homework Help Science Advisor	The brightness would go like cos of the angle.

cesiumfrog	Is this only because the greater the angle, the greater the surface area that the beam interacts with? Or are there other factors?

Meir Achuz Recognitions: Homework Help Science Advisor	incident light angle brightness It is just that Intensity = Power/area

robphy Blog Entries: 47 Recognitions: Gold Member Homework Help Science Advisor	There is also an inverse-square dependence, which is negligible if (for example) a point-like source is very far from the surface.