Is There Significant Energy Loss in Refracted and Focused Light?

In summary, the conversation discusses the loss of energy in light that is refracted through media and focused via a parabolic lens. It is mentioned that normally incident light on a refracting media with an index of refraction n has a power loss of (n-1)^2/(n+1)^2, which is approximately 4% for glass with n=1.5. It is also noted that the loss in a front-surface parabolic mirror is close to zero. Bob S mentions that this formula can be applied for general media, and there is about 8% energy loss when light passes through a glass lens without anti-reflection coating. However, Bob S also suggests that using a front-surface-silver
  • #1
ssope
33
0
I am wondering if there is a significant loss in energy (greater than 2%) in light that is refracted through media. I also am wondering the same about energy loss in light that is focused via a parabolic lens.
 
Engineering news on Phys.org
  • #2
Normally incident light on a refracting media with index of refraction n from air with n=1, or from the same media to air, has a power loss of

Power loss = (n-1)2/(n+1)2= 0.25/6.25 = 4% for glass with n=1.5.

So for going through a glass lens without anti-reflection coating, the loss is about 8%. The loss in a front-surface parabolic mirror is near zero.

Bob S
 
  • #3
Hi Bob S! :smile:

And (I' m guessing :blushing:) is it (n1-n2)2/(n1+n2)2 for general media?
 
  • #4
Is there energy loss in light that is focused via a parabolic lens?
 
  • #5
ssope said:
Is there energy loss in light that is focused via a parabolic lens?

uhh? Bob S :smile: just said so … about 8%.
 
  • #6
I said 0% using a front-surface-silvered parabolic mirror, 8% through a refracting glass lens.
Bob S
 
  • #7
I'm not sure that 0% is correct. I know that even the best silvered dielectric mirros offer 99% reflection
 

FAQ: Is There Significant Energy Loss in Refracted and Focused Light?

What causes a loss of power in light and energy sources?

There are several factors that can contribute to a loss of power in light and energy sources. These include changes in temperature, aging of materials, and disruptions in the electrical circuit.

How does temperature affect the power output of light and energy sources?

Temperature can impact the power output of light and energy sources in various ways. In some cases, high temperatures can cause overheating and decrease the efficiency of the source. In others, low temperatures can cause materials to contract, resulting in loose connections or reduced conductivity.

Can the type of material used in a light or energy source affect its power output?

Yes, the type of material used can greatly impact the power output of a light or energy source. Some materials have higher conductivity and can transmit electricity more efficiently, resulting in a higher power output. On the other hand, materials with lower conductivity may cause a decrease in power output.

How can we prevent or minimize power loss in light and energy sources?

Regular maintenance and inspection of light and energy sources can help prevent or minimize power loss. This includes checking for loose connections, cleaning or replacing worn-out materials, and ensuring proper ventilation to prevent overheating.

Are there any alternative energy sources that are less prone to power loss?

Yes, there are alternative energy sources that are less prone to power loss, such as solar or wind energy. These sources use renewable resources and have fewer mechanical parts that can wear out over time, resulting in a more stable power output.

Similar threads

Replies
1
Views
1K
Replies
3
Views
717
Replies
10
Views
2K
Replies
9
Views
3K
Replies
1
Views
2K
Replies
9
Views
1K
Back
Top