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J: Phys > Mirrors And Lenses > Flashcards

Mirrors And Lenses Flashcards

1
Q

Simplest flat reflective surface mirror

A

Plane mirror

  • reflect perpendicularly or at same angle as normal
  • those that are in your house
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2
Q

Convergence vs Divergence mirrors cause:

A

Concave mirrors cause light rays to converge

Convex mirrors cause light rays to diverge

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3
Q

Where is the focal point on a concave mirror?

A

Same Side

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4
Q

Where is the focal point on a convex mirror?

A

Opposite side

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5
Q

Master thin lens equation (and for mirrors)

A

1/o + 1/i = 1/f

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6
Q

Positive vs negative “i” value in thin lens:

A

Positive = real (in front of)

Negative = virtual (behind)

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7
Q

Positive vs negative object, “o” value:

A

+: in front of mirror

-: behind

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8
Q

Positive vs negative focal length value

A

+: concave: converging

-: convex: diverging

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9
Q

magnification equation

A

M = -i/o

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10
Q

Magnification pos vs negative

A

Pos: upright and virtual

Neg: inverted and real

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11
Q

Rays of a ray diagram:

A

1) Top of the object parallel and intersect focal point
2) Bottom of the image and parallel to normal
- image is intersection of rays

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12
Q

Equation of plane mirror:

A

Focal length = infinity

O = -I

Magnification is 1

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13
Q

Convex mirror equation

A
  • focal length is < 0
  • o > 0 (object in front of mirror)
  • i < 0, virtual image behind mirror
  • M is positive
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14
Q

Concave mirror thin lens equation

A

O > 0, F > 0, depends on object distance
- O > F = positive I, real image
M is negative, so real and inverted

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15
Q

Convex mirror produces

A
  • usually smaller, virtual (upright), and behind
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16
Q

Concave mirror can produce

A

O>F
- pos i: so in front of mirror, positive m: so real and inverted

F>O
- neg i: so behind mirror, negative m: so virtual and upright

17
Q

Focal point of a mirror is:

A

Radius / 2

- point where parallel rays of light entering a mirror always converge

18
Q

Opposite convention of rays for mirrors and lenses

A

Concave mirror: cause rays to converge

Concave lens: cause rays to diverge

19
Q

Index of refraction equation:

A

1/f = (n-1) (1/r1 - 1/r2)

20
Q

Power of diopter

A

P = 1/f

Smaller focal length, smaller radius, more sharply curved, bend light more than sphere with larger radius

21
Q

Nearsighted individuals have what type of lens:

A
  • lens refracts too much

- light converges in front

22
Q

How is nearsightededness corrected:

A

Using diverging or concave lens

23
Q

What is the issue in farsightedness:

A

Light is not bent sufficiently, light rays converge past retina

24
Q

How is farsightedness corrected?

A

use a converging lens to focus light in front of normal focal point on retina

25
Q

In lenses, positive focal length indicates:

A

Converging (convex) lens

26
Q

In lenses, negative focal length indicates:

A

Diverging, concave lens

27
Q

Color and absorbance

A

region of lowest to no absorbance on absorbance spectrum

28
Q

Convex mirror always has what focal length

- what lens does this relate to

A

negative: upright and virtual image

relates to concave/divering lens

29
Q

Concave lens is also called ____

  • focal length is?
  • relates to what mrriro?
A

diverging lens (myopia)

  • focal length always negative > UV
  • relates to convex mirror
30
Q

focal length related to radius

A

f = r/2

31
Q

Equation for diopter

A

P = 1 / f (in m-1)

32
Q

Convex lens

  • also called?
  • relates to what mirror?
  • focal length and distance create what type of images

the farther away the object is from the focal length: what happens to image size

A

Convering lens, related to concave mirror

  • d < focal length = upright and virtual
  • d > focal length = real and inverted
  • the smaller it becomes

J: Phys (15 decks)

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