Physical Science Assignment 17

The ______ and more ______ a lens is, the more it will refract light rays.

thicker, curved

Which way does a concave lens bend light?

toward the edges

An image that your brain perceives even though no light rays pass through it is called a(n) ______ image.

virtual

Which of the following images do light rays never pass through?

virtual

An image that your brain perceives even though no light rays pass through it; an image formed by a plane mirror

virtual image

What can you draw as a conclusion for this lab?

As a conclusion for this lab I could say that farsightedness is not always corrected with convex lenses and concave lenses don't always correct Nearsightedness, according to the lab.

Why are concave lenses referred to as diverging lenses?

Because it diverges the parallel rays of light that pass through it.

What are the cornea and the retina of the eye?

The cornea is the first lens that light enters in your eye and is causes the light rays to bend so they can converge to create an image. After exploring the cornea, the light rays then enter the eyeball through the pupil and makes friends with the retina. The retina is the lining in your eye which converts the light image into electric signals which gets carried to your brain where they can be interpreted.

Describe the difference between a convex lens and a concave lens.

The difference between a convex and a concave lens is that a convex lens turns outward like the outside of a bowl and a concave lens turns inward like the inside of a bowl.

What is the difference between nearsightedness and farsightedness?

The difference is that nearsightedness is when the eye can't focus on objects far away but can clearly see close objects. Farsightedness is the opposite when the eye can clearly see far away objects but can't focus on near things.

A(n) ______ lens is thinner in the middle and thicker at the edges.

concave

If the surface of a mirror is curved inward, it is called a(n) ______ mirror.

concave

Which mirror can form an enlarged image?

concave

A mirror that curves inwards

concave mirror

Which of the following is used in a headlight of a car?

concave mirror

A mirror that curves outward like the back of a spoon is a(n) ______ mirror.

convex

A(n) ______ lens is thicker in the middle than at the edges.

convex

What type of lens is used to correct farsightedness?

convex lens

A mirror that curves outward like the back of a spoon

convex mirror

Light enters the eye through a transparent covering on the eyeball called the ______.

cornea

When the eye cannot focus properly, disorders occur. ______ is the inability of the eye to focus n nearby objects, and ______ is the inability of the eye to focus on far objects.

farsightedness, nearsightedness

The distance from the center of the mirror to the focal point

focal length

The distance from the center of the mirror to the focal point is called the ______.

focal length

Every light ray that travels parallel to the optical axis before hitting a concave mirror is reflected through the ______.

focal point

Every light ray traveling parallel to the optical axis as it approaches a concave mirror is reflected through this point

focal point

The point at which converging light rays meet is called the ______.

focal point

A(n) ______is any type of transparent material that bends light. The bending of light is called______.

lens, refraction

The human eye contains its own ______. In an eye with normal vision, this lens is able to focus light rays on the______.

lens, retina

______ worn in front of the eye can correct vision disorder by either ______ or ______ light rays enough so that the eye's lens can focus them on the retina.

lenses, spreading out, bringing together

Describe how to find the image produced if an object is placed in front of a concave mirror outside the focal point.

A ray must be drawn from the top of the image parallel to the optical axis to the mirror and reflected back through the focal point. A second ray must be drawn from the top of the object through the focal point to the mirror and reflected back parallel to the optical axis until it intersects the first ray drawn. The intersection is where the top of the image appears to be

Which of the following best describes image formation by a plane mirror?

A virtual image is formed behind the mirror

Describe the difference between a concave and a convex lens.

A concave lens is thinner in the middle than at the edges. A convex lens is thicker in the middle than at the edges

Which type of lens corrects the vision problems of farsightedness, and which corrects the vision problems of nearsightedness?

Farsightedness is usually corrected with convex lenses while nearsightedness is usually corrected with concave lenses.

Explain what farsightedness and nearsightedness are and how each are corrected. Explain.

Farsightedness is when someone can see objects clearly far away but can't focus on objects nearby. This can be corrected by wearing convex glasses, lenses. Nearsightedness is when someone can see objects clearly near their eyes but can't focus when something s far away. To correct this, people usually wear concave lenses or glasses.

How are lenses used to correct vision?

Lenses are used to correct vision by changing the refracted light to focus on the retina.

What happens to parallel light rays when they hit a concave mirror?

Light travels parallel to the optical axis and converges through the focal point.

What type of lens should be used to correct nearsightedness? farsightedness?

Nearsightedness is usually corrected with concave lenses and convex lenses are usually used to correct farsightedness.

What happens to parallel light rays when they hit a convex mirror?

The light travels parallel to the optical axis but reflects outwards away from the focal point.

Describe the path of reflected light waves as parallel light waves hit a concave mirror.

The parallel light waves will be reflected back through the focal point; the image that is formed by a concave mirror changes depending on where the object is located relative to the focal point of the mirror.

Explain how you would locate the image formed by a candle standing beyond the focal point of a concave mirror.

The question didn't ask how to know if the image would be beyond the focal point; it asked how to know where the image would be located First draw a ray from the top of the candle parallel to the optical axis to the mirror and reflected back through the focal point. Draw the second ray through the focal point to the mirror and reflected back parallel to the optical axis. Where the two intersect, draw the image.

An imaginary straight line drawn perpendicular to the surface of the mirror at its center

optical axis

The ______ is an imaginary straight line drawn perpendicular to the surface of the mirror at its center.

optical axis

As ______ rays of light pass through a lens, they are______ in such a way that they either come together ______, or spread out ______.

parallel, refracted, converge, diverge

A flat smooth mirror

plane mirror

A flat, smooth surface that reflects light and forms an image is a(n) ______.

plane mirror

A(n) ______ image is formed when light rays converge to form the image.

real

Formed when light rays converge to form an image

real image

What do lenses do?

refract light

The inner lining of the eye that converts light images into electrical signals is called the ______.

retina