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# Physics

Jarred Krajcik

Lvl 10
2021-09-30 20:42:42
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Cards in this guide (20)
How does a refracting telescope work

A refracting telescope works just like a magnifying glass. It uses a convex glass lens (to bend light and bring it into focus. This lens is thicker in the center than it is toward its edges, which bends the light more at the edge of the lens than light coming through the center. This allows all of the light to come together at a focus point. The point of focus is where the image is created.

If someone looks into the eyepiece, a concave lens magnifies the image

Refracting telescopes have two main problems-images are not always clear because the light is being bent and the size of the lens is limited (which limits the power of the telescope).

What is the index of refraction

The refractive index is the ratio of the speed of light in a vacuum to the speed of light in a medium.

How does a lenes work

a lens is a transparent material that refract slight in a particular way.

Why does a small hole on a pinhole camera give a sharp but dim image

A pinhole camera image will be dim with a small hole because not much light rays are able to get through the hole.

********

Who told you it was sharp? It is anything but.

Is a contrapositive statement true

If a conditional statement is true, then so is its contrapositive. (And if its contrapositive is not true, then the statement is not true).

What causes light to refract when it hits a piece of glass

the light rays hit the piece of glass and the surface of the glass causes it to refract

What type of image is formed by a reflecting telescope

the images are clear and can be focused unlike a refracting telescope witch sags under its own weight causing images to be distorted

Any telescope forms a real image. Otherwise, it's pretty useless as a telescope.

Comments: Refracting telescopes are good these days. They should not sag. Also, Galileo's telescope formed a virtual image, and that wasn't useless.

An important point about the image in a reflecting telescope is that it is inverted, as well as being a real image.

Which lens can produce a virtual image and a real image

A Biconvex lens

What is the law of reflection for light

When a ray of light strikes a plane mirror, the light ray reflects off the mirror. Reflection involves a change in direction of the light ray. The convention used to express the direction of a light ray is to indicate the angle which the light ray makes with a normal line drawn to the surface of the mirror. The angle of incidence is the angle between this normal line and the incident ray; the angle of reflection is the angle between this normal line and the reflected ray. According to the law of reflection, the angle of incidence equals the angle of reflection.

What best describes a concave lens

thicker at the edges that in the middle

What is the image of a flower formed inside a camera

Not sure

What condition enables a person to see nearby objects clearly but distant objects are blurry

Nearsightedness occurs when the physical length of the eye is greater than the optical length.

What explains why light bends when it passes from air to water

it changes speed.

Why does a microscope slide need to be transparent

So light can pass through the slide to the objective.

Which best describes a material with a low index of refraction

It causes light to slow and refract very little.

What part of a refracting telescope forms the image

tacos

What structure is used to focus light in a reflecting telescope

A concave mirror.

Which type of lens will produce a virtual image

Both concave and convex lens produce a virtual image. The convex lens is also able to produce a real image, but the concave one isn't.

Which part of a camera opens and closes briefly to allow light into the camera

The shutter.

At the point of a converging lens the object cannot be seen.

focal

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