When light strikes glass perpendicularly, about 4% is reflected at each surface. Show that 92% o

Name: Problem 40, Chapter 28: Conceptual Physics
Uploaded: 2019-08-28T07:04:07-08:00
Duration: 1 min 29 s
Channel: Sri Datta Vikas Buchemmavari
Description: When light strikes glass perpendicularly, about 4% is reflected at each surface. Show that 92% of light is transmitted through a pane of window glass.

step 1 So now we have a glass sheet and light falls on the surface, reflects, a little bit of it is ref

When light strikes glass perpendicularly, about 4% is...

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Key Concepts

Reflection Coefficient

This concept describes the fraction of incident light that is bounced back when it encounters a boundary between two media with different refractive indices. At normal incidence, Fresnel's equations simplify, telling us that a certain percentage (in this context, around 4%) of the light is reflected at the interface.

Transmission Coefficient

The transmission coefficient is the complementary fraction of the light that passes through the interface without being reflected. It is calculated as one minus the reflection coefficient. For normal incidence, if 4% of the light is reflected, then about 96% is transmitted through a single surface.

Multiplicative Effect of Successive Interfaces

When light passes through more than one interface, such as the two surfaces of a glass pane, the overall transmission is determined by multiplying the transmission coefficients of each interface. This concept explains why even small losses at each interface can combine to yield a noticeably lower total transmission percentage, such as the calculated 92%.

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