Question 1

The ciliary muscle of the eye is relaxed under which condition?

Accepted Answer

A)  eye is focused on a distant object 
B)  eye is focused on a nearby object 
C)  subject being viewed is well illuminated 
D)  subject being viewed is dimly illuminated 
A)  eye is focused on a distant object 
B)  eye is focused on a nearby object 
C)  subject being viewed is well illuminated 
D)  subject being viewed is dimly illuminated

Question 2

A low f-number:

Accepted Answer

A)  allows a smaller depth of field. 
B)  allows using a faster shutter speed. 
C)  causes less spherical aberration. 
D)  is not related to any of the above options. 
A)  allows a smaller depth of field. 
B)  allows using a faster shutter speed. 
C)  causes less spherical aberration. 
D)  is not related to any of the above options.

Question 3

A diverging lens will be prescribed by the eye doctor to correct which of the following?

Accepted Answer

A)  myopia 
B)  presbyopia 
C)  hyperopia 
D)  astigmatism 
A)  myopia 
B)  presbyopia 
C)  hyperopia 
D)  astigmatism

Question 4

What must be the resolving power of a grating allowing a spectral line at 683.80 nm to be distinguished from another line differing by 0.33 nm? (1 nm = 10−9 m)

Accepted Answer

A)  2,100 
B)  46 
C)  4,300,000 
D)  230 
E)  ​684 
A)  2,100 
B)  46 
C)  4,300,000 
D)  230 
E)  ​684

Question 5

A nearsighted person cannot see objects clearly beyond 70 cm (the far point).If the patient has no astigmatism and contact lenses are prescribed,what is the power of the lens required to correct the patient's vision?

Accepted Answer

A)  −0.7 diopters 
B)  −1.4 diopters 
C)  −2.9 diopters 
D)  −7.0 diopters 
E)  ​-700 diopters 
A)  −0.7 diopters 
B)  −1.4 diopters 
C)  −2.9 diopters 
D)  −7.0 diopters 
E)  ​-700 diopters

Question 6

A refracting astronomical telescope has objective and eyepiece lenses of focal lengths 30.0 cm and 0.40 cm,respectively.What is the angular magnification of this instrument?

Accepted Answer

A)  25 
B)  49 
C)  75 
D)  143 
E)  ​30.4 
A)  25 
B)  49 
C)  75 
D)  143 
E)  ​30.4

Question 7

A lens with a focal length of 20 cm has what power?

Accepted Answer

A)  5.0 diopters 
B)  0.2 diopters 
C)  2 diopters 
D)  -5.0 diopters 
E)  0.02​ diopters 
A)  5.0 diopters 
B)  0.2 diopters 
C)  2 diopters 
D)  -5.0 diopters 
E)  0.02​ diopters

Question 8

If different filters are used with an astronomical telescope,which of the following would give the best resolution?

Accepted Answer

A)  red 
B)  yellow 
C)  green 
D)  ​purple 
E)  ​All yield the same resolution. 
A)  red 
B)  yellow 
C)  green 
D)  ​purple 
E)  ​All yield the same resolution.

Question 9

What is the f-number of a camera lens that has an aperture-opening diameter of 0.30 cm and a focal length of 6.0 cm?

Accepted Answer

A)  0.30 
B)  1.8 
C)  20 
D)  6.0 
E)  ​0.05 
A)  0.30 
B)  1.8 
C)  20 
D)  6.0 
E)  ​0.05

Question 10

While a camera has film where the image is formed,the eye forms the image on the:

Accepted Answer

A)  pupil. 
B)  cornea. 
C)  retina. 
D)  optic nerve. 
A)  pupil. 
B)  cornea. 
C)  retina. 
D)  optic nerve.

Question 11

What is the approximate magnification of a compound microscope with objective and eyepiece focal lengths of 0.30 cm and 4.1 cm,respectively,and a separation between lenses of 40 cm?

Accepted Answer

A)  320 
B)  33 
C)  32 
D)  810 
E)  ​7.1 
A)  320 
B)  33 
C)  32 
D)  810 
E)  ​7.1

Question 12

Using a camera with a fixed focal length lens,how will decreasing the f-number affect the depth of field and the intensity of the light reaching the ccd (or film)?

Accepted Answer

A)  The depth of field will increase as will the intensity of light reaching the ccd. 
B)  The depth of field will increase but the intensity of light reaching the ccd will decrease. 
C)  The depth of field will decrease as will the intensity of light reaching the ccd. 
D)  The depth of field will decrease but the intensity of light reaching the ccd will increase. 
A)  The depth of field will increase as will the intensity of light reaching the ccd. 
B)  The depth of field will increase but the intensity of light reaching the ccd will decrease. 
C)  The depth of field will decrease as will the intensity of light reaching the ccd. 
D)  The depth of field will decrease but the intensity of light reaching the ccd will increase.

Question 13

Why is it easier to see fine print in brighter light than in dimmer light?

Accepted Answer

A)  This is not so,it is easier to see fine print in dimmer light than in brighter light. 
B)  Because the power (in diopters)of the eye increases as the light intensity increases. 
C)  In brighter light,the longer wavelengths dominate. 
D)  In brighter light,the f-number of the eye increases. 
A)  This is not so,it is easier to see fine print in dimmer light than in brighter light. 
B)  Because the power (in diopters)of the eye increases as the light intensity increases. 
C)  In brighter light,the longer wavelengths dominate. 
D)  In brighter light,the f-number of the eye increases.

Question 14

A simple magnifier makes an image appear at the near point distance from the eye of the viewer (25 cm).What is the magnifying power of the magnifier if it is constructed of a lens of focal length of 5.0 cm?

Accepted Answer

A)  1.2 
B)  5.11 
C)  7 
D)  62 
E)  ​5.62 
A)  1.2 
B)  5.11 
C)  7 
D)  62 
E)  ​5.62

Question 15

Which term identifies the defect where the lens produces a line image of a point source?

Accepted Answer

A)  myopia 
B)  presbyopia 
C)  hyperopia 
D)  astigmatism 
A)  myopia 
B)  presbyopia 
C)  hyperopia 
D)  astigmatism

Question 16

A thin lens of focal length 20 cm is placed in contact with a 40-diopter thin lens.What is the power of the combined lenses?

Accepted Answer

A)  1/4 diopter 
B)  35.0 diopters 
C)  45.0 diopters 
D)  80 diopters 
E)  ​4 diopters 
A)  1/4 diopter 
B)  35.0 diopters 
C)  45.0 diopters 
D)  80 diopters 
E)  ​4 diopters

Question 17

If the objective lens of a compound microscope is replaced with a lens of double the focal length while the eyepiece also has its focal length doubled,what will happen to the overall magnification of the microscope?

Accepted Answer

A)  This will result in no change in the magnification. 
B)  The magnification doubles. 
C)  The magnification quadruples. 
D)  The magnification decreases. 
A)  This will result in no change in the magnification. 
B)  The magnification doubles. 
C)  The magnification quadruples. 
D)  The magnification decreases.

Question 18

A camera has a lens of focal length 50 mm and a speed of f/2.0.What is the diameter of the lens?

Accepted Answer

A)  12.5 mm 
B)  25.0 mm 
C)  50 mm 
D)  100 mm 
E)  ​2.0 mm 
A)  12.5 mm 
B)  25.0 mm 
C)  50 mm 
D)  100 mm 
E)  ​2.0 mm

Question 19

The pupil of the eye increases in size under which condition?

Accepted Answer

A)  eye is focused on a distant object 
B)  eye is focused on a nearby object 
C)  object viewed is dimly illuminated 
D)  object viewed is well illuminated 
A)  eye is focused on a distant object 
B)  eye is focused on a nearby object 
C)  object viewed is dimly illuminated 
D)  object viewed is well illuminated

Question 20

Which eye defect is corrected by a lens having different curvatures in two perpendicular directions?

Accepted Answer

A)  myopia 
B)  presbyopia 
C)  hyperopia 
D)  astigmatism 
A)  myopia 
B)  presbyopia 
C)  hyperopia 
D)  astigmatism

Exam 25: Optical Instruments

The ciliary muscle of the eye is relaxed under which condition?

A low f-number:

A diverging lens will be prescribed by the eye doctor to correct which of the following?

What must be the resolving power of a grating allowing a spectral line at 683.80 nm to be distinguished from another line differing by 0.33 nm? (1 nm = 10−9 m)

A nearsighted person cannot see objects clearly beyond 70 cm (the far point).If the patient has no astigmatism and contact lenses are prescribed,what is the power of the lens required to correct the patient's vision?

A refracting astronomical telescope has objective and eyepiece lenses of focal lengths 30.0 cm and 0.40 cm,respectively.What is the angular magnification of this instrument?

A lens with a focal length of 20 cm has what power?

If different filters are used with an astronomical telescope,which of the following would give the best resolution?

What is the f-number of a camera lens that has an aperture-opening diameter of 0.30 cm and a focal length of 6.0 cm?

While a camera has film where the image is formed,the eye forms the image on the:

What is the approximate magnification of a compound microscope with objective and eyepiece focal lengths of 0.30 cm and 4.1 cm,respectively,and a separation between lenses of 40 cm?

Using a camera with a fixed focal length lens,how will decreasing the f-number affect the depth of field and the intensity of the light reaching the ccd (or film)?

Why is it easier to see fine print in brighter light than in dimmer light?

A simple magnifier makes an image appear at the near point distance from the eye of the viewer (25 cm).What is the magnifying power of the magnifier if it is constructed of a lens of focal length of 5.0 cm?

Which term identifies the defect where the lens produces a line image of a point source?

A thin lens of focal length 20 cm is placed in contact with a 40-diopter thin lens.What is the power of the combined lenses?

If the objective lens of a compound microscope is replaced with a lens of double the focal length while the eyepiece also has its focal length doubled,what will happen to the overall magnification of the microscope?

A camera has a lens of focal length 50 mm and a speed of f/2.0.What is the diameter of the lens?

The pupil of the eye increases in size under which condition?

Which eye defect is corrected by a lens having different curvatures in two perpendicular directions?

Introduction

Introduction: Part A

Motion in One Dimension

Motion in One Dimension: Part A

Vectors and Two-Dimensional Motion

Vectors and Two-Dimensional Motion: Part A

The Laws of Motion

The Laws of Motion: Part A

Energy

Energy: Part A

Momentum and Collisions

Momentum and Collisions: Part A

Rotational Motion and the Law of Gravity

Rotational Motion and the Law of Gravity: Part A

Rotational Equilibrium and Rotational Dynamics

Rotational Equilibrium and Rotational Dynamics: Part A

Solids and Fluids

Solids and Fluids: Part A

Thermal Physics

Thermal Physics: Part A

Energy in Thermal Processes Heat and Internal Energy

Energy in Thermal Processes Heat and Internal Energy: Part A

The Laws of Thermodynamics Work in Thermodynamic Processes

The Laws of Thermodynamics Work in Thermodynamic Processes: Part A

Vibrations and Waves

Vibrations and Waves: Part A

Sound

Sound: Part A

Electric Forces and Electric Fields

Electric Forces and Electric Fields: Part A

Electrical Energy and Capacitance

Electrical Energy and Capacitance: Part A

Current and Resistance Electric Current

Current and Resistance Electric Current: Part A

Direct-Current Circuits Sources of EMF

Direct-Current Circuits Sources of EMF: Part A

Magnetism Magnets

Magnetism Magnets: Part A

Induced Voltages and Inductance

Induced Voltages and Inductance: Part A

Alternating-Current Circuits and Electromagnetic Waves

Alternating-Current Circuits and Electromagnetic Waves: Part A

Reflection and Refraction of Light

Reflection and Refraction of Light: Part A

Mirrors and Lenses

Mirrors and Lenses: Part A

Wave Optics

Wave Optics: Part A

Optical Instruments: Part A

Relativity

Relativity: Part A

Quantum Physics Blackbody Radiation and Plancks Hypothesis

Quantum Physics Blackbody Radiation and Plancks Hypothesis: Part A

Atomic Physics

Atomic Physics: Part A

Nuclear Physics

Nuclear Physics: Part A

Nuclear Energy and Elementary Particles

Nuclear Energy and Elementary Particles: Part A

What must be the resolving power of a grating allowing a spectral line at 683.80 nm to be distinguished from another line differing by 0.33 nm? (1 nm = 10−⁹ m)