0
Why does a magnifying glass must be held so that the light from the sun forms a circular dot to burn paper?
Wiki User
∙ 8y ago
A magnifying glass forms a circular dot where it focuses rays of light from the sun. The focus of a magnifying glass is at a distance from the surface of the glass itself. So a magnifying glass must be held [approximately] perpendicular to the line joining the sun and the target, and at a distance from the target which equals the focal length of the lens.
Wiki User
∙ 8y ago
Add your answer:
Earn +20 pts
How does the speed of light that emerges from a pane of glass compare with the speed of light incident on the glass?
Those speeds are equal, even though the speed of the light was temporarily less while it was inside the glass.
The circular area of light you see when you look through a microscope is?
field of view
How does the speed of light in glass compare to the speed of light in a vacuum?
It will depend on the type of glass, and something called its refractive index. All materials have a refractive index which will effect the speed of the light through it. The speed of light through a vacuum is 3.0x10^8 m/s, and a material such as glass will be lower than this.
How is the speed of light in glass affected by the succession of time delays that accompany the absorption and re emission of light from atom to atom in the glass?
bro, just do your physics homework
How does the average speed of light in glass compass with its speed in a vacuum?
There are several different types of glass, and light has a somewhat different speed in each of them. On the average, the speed of light across all typical types of glass is in the neighborhood of 2/3 its speed in vacuum, or around 200,000 km/sec .
What is the different between a magnifying glass and a compound light microscope?
A magnifying glass has one lenses and a compound light microscope has 2 lenses
What are examples of light reflections?
A magnifying glass reflecting light.
What is a magnifying glass made of?
the magnifying glass has a convex lens and it curves to magnify objects.
How do you cook a marsh mellow under the sun?
Take a magnifying glass and put in under the sun so that there is a small light that forms. lay the marshmellow under that light and wait.
What principle of light a magnifying glass make use of?
The refraction.
Can you heat water a magnifying glass with an artificial light source instead of the sun?
Sure. But the magnifying glass can't squeeze any more heat out of your light sourcethan what the source has without the magnifying glass.The only thing the magnifying glass does is take all of the light ... and maybe heat ? ...that hits the magnifying glass and focus it down to a very small area. It has no moreheat or light to work with than what enters the glass.The most efficient way to heat water with a light bulb is to shine the bulb straight upand hang the pot over it.
How do you make fire with a magnifying glass?
It's quite easy- take a magnifying glass and a dry piece of a paper ( preferably newspaper ) and go to a place where appropriate sunlight is available. Let the light of sun fall on to the magnifying glass. Bring the piece of paper beneath the magnifying glass. Now your objective is to move the magnifying glass up and down in such a way that the light emerging from the magnifying glass concentrates to a point. Hold the both things in the same position for a while, and soon you will be able to see the miracle, fire without a matchstick ! Enjoy!
Why is a magnifying glass considered an Optical Device?
Because a magnifying glass is made of of convex lens. It converses light rays and magnifies the objects seen through it.
Will light and a magnifying glass cook a smore?
try it and then email me with the results
When you place magnifying glass under the sunlight and this light absorbed by the paper what happen?
The lens of the magnifying glass concentrates the sun's light to a point. At that point the paper is heated to its ignition temperature and it can catch fire
How does light bend without any source?
It bends in water or a magnifying glass.
What are the advantage of using a magnifying glass that is foldable with built-in light?
Idont know the answer
