Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Optics Block 2 > Week 3 > Flashcards

Week 3 Flashcards

1
Q

What lenses can give you inverted images?

A

-only plus lenses!!!!(convex)

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

What lenses can give you magnified images?

A

-only plus lenses!!!!(convex)

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

What lenses can give you an image that is 1/2 the size of the object?

A

-both convex and concave lenses

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

What lenses can give you an image that is 2 times the size of the object?

A

-only plus lenses!!!(convex)

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

Where are the front and back focal lengths measured from?

A

-measured from vertex of the lens

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

Where are the effective focal lengths measured from?

A

-measured from principal planes

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

What is the power of the human eye?

A
  • cornea=+40D

- Crystalline lens=+20D

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

What kind of image is projected on the retina?

A
  • small
  • inverted
  • real
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Why is the human eye a plus lens?

A

-the index of refraction of the aqueous solution it sits in gives it a plus power

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

Microscope lens set up

A
  • two lens structure
  • both plus lenses
  • image from the first lens is the object of the second lens
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Microscope imaging

A
  • object for second lens is image from the first
  • object for second lens is on focal point, so image is projected at optical infinity
  • magnified, virtual image
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Magnification of a microscope and telescope

A

M=Mobjective*Meyepiece

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

Resolution Limit

A
  • the SEPARATION between closest distinguishable points imaged through an optical instrument
  • smaller the better(smaller separation=higher resolution)
  • expressed in angle or length
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Resolving Power

A
  • the RECIPROCAL OF THE SEPARATION between the closest distinguishable points imaged through an optical instrument
  • the larger the better
  • expressed in inverse angle or inverse length
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Resolution and resolving power

A

-dependent on wavelength

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

Resolution of the human eye

A
  • 2mm for day light

- with wavelength, about 0.86 arcmin

17
Q

Telescope structure

A
  • two lens system
  • light from distant object(optical infinity, collimated light)
  • collimated beams exit second lens, with a smaller diameter than the ones that entered
18
Q

Power of a telescope

A
  • vergence is zero before AND after, so power is ZERO

- principal planes are at optical infinity

19
Q

Compare microscope and telescope

A

Microscope: observe near object

  • distance between lenses is larger than sum of focal lengths
  • image is magnified, inverted, dim
  • strong vergence for entering beam

Telescrope: observe distant object

  • distance between lenses is equal to the sum on the focal lengths
  • Image is minified, inverted, bright
20
Q

Telescope magnification

A
  • minifies object
  • -changes the angle in which we see the object, not the size of the object!!
  • looks 20-50 times larger than it would with the naked eye
21
Q

Telescope resolution

A
  • minimum angle of resolution=( 1.22* wavelength)/objective lens diameter
  • a telescope with D=2, separation is 0.06 arcsec
22
Q

Eye resolving power

A

Museful*angle of resolution

-0.3mrad

23
Q

Field of view

A

-can have same magnification and different field of view

24
Q

telescope resolution dependent factors

A
  • higher resolution for smaller wavelength
  • use blue filter for better resolution
  • increase Diameter of lens for smaller/finer resolution
25
Q

Kepler-type telescrope

A
  • 2 plus lenses
  • used in astronomy
  • lenses separated by sum of focal lengths
  • objective lens has larger diameter
  • eye piece has higher power
26
Q

Kepler-type telescope imaging

A
  • image is virtual and at optical infinity

- image is inverted

27
Q

Galilei-type telescope

A
  • one plus(objective lens) and one minus(eye piece)
  • used for terrestrial things
  • lenses are separated by focal objective-focal eyepiece
  • low vision aids
28
Q

Galilei-type telescope imaging

A

-image is virtual and ERECT

29
Q

Newtonian refractor

A

-adds a deviation mirroe

30
Q

Catadioptric telescopes

A

-combination of refraction and diffraction

31
Q

Radiotelescope

A
  • uses radio waves instead of light

- hydrogen atom emission

32
Q

Why do stars twinkle?

A
  • atmosphere is non uniform lens

- pollution, scattering, hot/ cold, can alter images

33
Q

Benefits to reflection

A
  • no chromatic aberration
  • only one surface precision
  • no need for large volume of glass
  • better support(less weight)
34
Q

What is the primary shape large mirrors use for their little pieces?

A

Hexagonal

35
Q

What electromagnetic waves are used for space observation?

A

IR

Optics Block 2 (3 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions