Lenses Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

What are the two types of lenses?

A

Convex and concave lenses

Convex lenses converge light, while concave lenses diverge light.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Describe the shape of a convex lens.

A

Starts thin at the top, gets thicker in the middle, then thinner again at the bottom

A diagram of a convex lens.

Convex lenses have a bulging shape that focuses light.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Describe the shape of a concave lens.

A

Starts thick at the top, gets thinner in the middle, then thicker again at the bottom

A diagram of a concave lens.

Concave lenses have a hollow shape that spreads light.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is the effect of using a โ€˜thinโ€™ convex lens?

A

Longer focal length

Thin convex lenses focus light over greater distances.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is the effect of using a โ€˜thickโ€™ convex lens?

A

Shorter focal length

Thick convex lenses focus light over shorter distances.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

List some uses of lenses.

A
  • Cameras
  • Glasses
  • Eyes
  • Telescopes
  • Microscopes

Lenses are used in various optical devices.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

How does the position of the object affect the position of the focus?

A

If the object is further away, the focus is closer; if the object is closer, the focus is further away

This principle is crucial for understanding lens behavior.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the definition of focal length?

A

The distance between the lens and where the rays are brought to a focus

Focal length is a key concept in optics.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Describe a simple experiment to measure focal length.

A

Place an object at a desired distance from the lens, measure this distance, then place a screen at a certain distance from the lens until a sharp image is formed and measure the distance between the lens and the image

Diagram for experiment

This method allows for practical understanding of focal length.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is the first rule for drawing ray diagrams?

A

Any ray of light that goes through the center of the lens will keep going in the same direction

This rule is fundamental for constructing accurate ray diagrams.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is the second rule for drawing ray diagrams?

A

Any ray of light traveling parallel to the principal axis will be turned to go through the principal focus on the way out of the lens

This rule illustrates how lenses manipulate light paths.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is the third rule for drawing ray diagrams?

A

Any ray that goes through the principal focus on the way in will emerge parallel to the principal axis

This rule helps predict the behavior of light after passing through a lens.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is the focus in relation to lenses?

A

The point where rays of light meet

Focus is a critical concept in understanding how lenses work.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is the relationship between lens type and light behavior?

A

Convex lenses converge light; concave lenses diverge light

Understanding this relationship is essential for applications of lenses.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Fill in the blank: The focal length is the distance between the lens and where the rays are brought to a _______.

A

focus

Focal length is a fundamental property of lenses.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

List some devices that utilize lenses.

A
  • Projectors
  • Cameras
  • Glasses
  • Eyes

Lenses are integral components in many optical devices.

17
Q

What is the effect of using a concave lens

A

Light rays are refracted.