Is it possible to use a lens to focus sunlight to a point hot enough to ...

5 Answers 5 ... No. The hottest temperature you could achieve by focusing sunlight is the temperature of the surface of the sun*. That is a few ...

Is it possible to reach higher local temperature than the surface ...

The radiation per surface area would be the same. A simpler argument is that all optics are reciprocal. If you point focus the sunlight, you ...

What would be the result of focusing sunlight onto one point ... - Quora

Here is a picture of someone using a large, low-precision (Fresnel) lens to smelt metal. At focus, the sunlight reaches 1000º C (hot enough ...

Q: How do lenses that concentrate light not violate the second law of ...

It certainly impossible to create new energy, but there's nothing to stop you from piping energy from one place to another (say, by running hot ...

What is the hottest you can make a focused beam of sunlight?

I know for sure that you can increase solar intensity arbitrarily by using lenses and mirrors. What I don't get is why this doesn't increase ...

Is there a way to focus the sun (with a magnifying lens?) & heat a ...

If the focal point is deliberately placed behind or into the object you are trying to heat, the surface area being heated increases, because the beam of light ...

Used a fresnel lens to heat? - Heating - Fieldlines.com

One problem: the focal point is only good when the sun is in one point in the sky. But you could have multiple fresnel lenses set to use the sun ...

How much heat can concentrated sunlight produce? - ResearchGate

You can use concave/convex mirrors to concentrate sun's rays to achieve higher degree of temperatures more than normal. For this you have to ...

Lens Experiment - Stony Brook University

where f is the focal length of the lens, do is the object distance and di is the image distance. From the Thin-Lens Equation we are able to mathematically see ...

Problem 16 Is it possible to start a fire b... [FREE SOLUTION] - Vaia

If the eyeglasses have convex lenses, they can potentially focus sunlight to a single point and generate heat. However, if the eyeglasses have concave lenses, ...

A novel way to concentrate sun's heat | MIT News

Most technologies for harnessing the sun's energy capture the light itself, which is turned into electricity using photovoltaic materials.

Concentrating Sunlight: It's Easy! - Educational Innovations Blog

A typical Fresnel lens of this type has a focal length of 10” to 11”. The 'ruled' side of the lens must face the sun. Some Examples: Focus the ...

Fusion: Using a lens to focus the energy of a star

So the hottest you could make something using a lot of lenses is as hot as the stars surface. For our sun that works out to ~5000°C, which is ...

Two mirrors to focus sunrays into a tiny spot -- possible?

Typically, a parabolic mirror is used for such purposes because it can focus parallel rays of sunlight into a single focal point. What type of ...

Q: What determines the size of the bright spot when you focus ...

Typically, when you try to focus sunlight with a lens you'll get something that looks like a comet. You turn the lens and move it up and down ...

Giant Fresnel Lens Deathray: an Experiment in Optics - Instructables

I found out the hard way that when the flat side of the lens is facing the sun, it doesn't work right (but well enough that you might not notice). So make sure ...

What type of lens would be helpful in starting a campfire? Why? - Vaia

A convex lens converges light rays to a single focal point, whereas a concave lens diverges light rays. Therefore, a convex lens can focus sunlight to a small ...

Rough Science . New Zealand . Ice . Ice Lens | PBS

An ice lens is a lens, made out of ice, which is meant to focus light onto one point. The idea is to focus sunlight onto dry bits of wood, straw, or paper and ...

Water Sphere Lens: Refraction & Light Science Activity - Exploratorium

Using the white card, find the distance from the lens to the image. This is the focal length. If an object is closer than one focal length to the center of the ...

New optical device could help solar arrays focus light, even under ...

Researchers imagined, designed, and tested an elegant lens device that can efficiently gather light from all angles and concentrate it at a fixed output ...