Question 1

A magnifying lens of power d (in diopters)gives what magnification when the viewing eye is relaxed assuming a near point of 25 cm?

Accepted Answer

A)  25d 
B)  0.25/d 
C)  d/4 
D)  The correct answer is not given. 
A)  25d 
B)  0.25/d 
C)  d/4 
D)  The correct answer is not given.

Question 2

You are designing eyeglasses for someone whose near point is 60 cm.What focal length lens should you prescribe so that an object can be clearly seen when placed at 25 cm in front of the eye?

Accepted Answer

A)  −18 cm 
B)  18 cm 
C)  43 cm 
D)  60 cm 
E)  ​-43 cm 
A)  −18 cm 
B)  18 cm 
C)  43 cm 
D)  60 cm 
E)  ​-43 cm

Question 3

Tripling the focal length of a telephoto lens,while holding aperture size constant,will change the light intensity admitted to the film by what factor?

Accepted Answer

A)  0.11 
B)  0.33 
C)  3.0 
D)  9.0 
E)  ​0.50 
A)  0.11 
B)  0.33 
C)  3.0 
D)  9.0 
E)  ​0.50

Question 4

A person's prescription for bifocals is -0.35 diopter for distant vision and +3.10 diopters for near vision,the near vision being accomplished by inserts into the distant vision lens.What is the net power of the near vision correction?

Accepted Answer

A)  2.75 diopters 
B)  3.10 diopters 
C)  3.45 diopters 
D)  1.085 diopters 
E)  ​More information is needed. 
A)  2.75 diopters 
B)  3.10 diopters 
C)  3.45 diopters 
D)  1.085 diopters 
E)  ​More information is needed.

Question 5

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

Accepted Answer

A)  farsightedness 
B)  glaucoma 
C)  nearsightedness 
D)  astigmatism 
A)  farsightedness 
B)  glaucoma 
C)  nearsightedness 
D)  astigmatism

Question 6

The Michelson interferometer can make precise length measurements using which of the following phenomena?

Accepted Answer

A)  force 
B)  interference 
C)  magnification 
D)  resolving power 
A)  force 
B)  interference 
C)  magnification 
D)  resolving power

Question 7

How many lines in a grating must be illuminated to obtain a resolving power of 400 in a fourth-order spectrum?

Accepted Answer

A)  1,600 
B)  100 
C)  400 
D)  10 
E)  ​40 
A)  1,600 
B)  100 
C)  400 
D)  10 
E)  ​40

Question 8

You are building a compound microscope with an objective lens of focal length 0.60 cm and an eyepiece lens of focal length 5.0 cm.You mount the lenses 18 cm apart.What is the maximum magnification of your microscope?

Accepted Answer

A)  5 
B)  10 
C)  75 
D)  150 
E)  ​18 
A)  5 
B)  10 
C)  75 
D)  150 
E)  ​18

Question 9

The "normal" eye has a near point of 25 cm.If a given individual's near point is 73 cm,for what problem will the eye doctor prescribe correction?

Accepted Answer

A)  myopia 
B)  presbyopia 
C)  hyperopia 
D)  astigmatism 
E)  ​color blindness 
A)  myopia 
B)  presbyopia 
C)  hyperopia 
D)  astigmatism 
E)  ​color blindness

Question 10

An individual's eye pupil changes from a diameter of 3.5 mm to 1.4 mm as the illumination is increased.By what factor does the minimum angle of resolution change?

Accepted Answer

A)  0.5 
B)  0.71 
C)  2.2 
D)  2.5 
E)  ​4.9 
A)  0.5 
B)  0.71 
C)  2.2 
D)  2.5 
E)  ​4.9

Question 11

If a person has hyperopia that person:

Accepted Answer

A)  may have an unusually long eyeball. 
B)  cannot see near objects clearly. 
C)  cannot relax the ciliary muscle adequately. 
D)  cannot form images behind the retina. 
A)  may have an unusually long eyeball. 
B)  cannot see near objects clearly. 
C)  cannot relax the ciliary muscle adequately. 
D)  cannot form images behind the retina.

Question 12

Glaucoma occurs because:

Accepted Answer

A)  the eye cannot accommodate properly. 
B)  the shape or size of the eye is not normal. 
C)  there is too much pressure in the fluid in the eyeball. 
D)  the lens is partially or totally opaque. 
A)  the eye cannot accommodate properly. 
B)  the shape or size of the eye is not normal. 
C)  there is too much pressure in the fluid in the eyeball. 
D)  the lens is partially or totally opaque.

Question 13

The Michelson interferometer is a device that may be used to measure:

Accepted Answer

A)  magnifying power of lenses. 
B)  light wavelength. 
C)  atomic masses. 
D)  electron charge. 
A)  magnifying power of lenses. 
B)  light wavelength. 
C)  atomic masses. 
D)  electron charge.

Question 14

The eye changes its f-number by:

Accepted Answer

A)  using the iris to change the size of the pupil. 
B)  using the ciliary muscle to change the focal length of the lens. 
C)  Both a & b are correct. 
D)  The eye does not change its f-number. 
A)  using the iris to change the size of the pupil. 
B)  using the ciliary muscle to change the focal length of the lens. 
C)  Both a & b are correct. 
D)  The eye does not change its f-number.

Question 15

A person has a near point of 40 cm and a far point of 1.0 m.When looking through lenses of focal length -1.0 m,what is the nearest an object can be to be seen clearly?

Accepted Answer

A)  29 cm 
B)  67 cm 
C)  134 cm 
D)  140 cm 
E)  ​68 cm 
A)  29 cm 
B)  67 cm 
C)  134 cm 
D)  140 cm 
E)  ​68 cm

Question 16

A fringe shift occurs for every ________ wavelength movement of the adjustable mirror in a Michelson interferometer.

Accepted Answer

A)  whole 
B)  half 
C)  quarter 
D)  eighth 
A)  whole 
B)  half 
C)  quarter 
D)  eighth

Question 17

A magnifier uses a:

Accepted Answer

A)  converging lens to form a real image. 
B)  converging lens to form a virtual image. 
C)  diverging lens to form a virtual image. 
D)  diverging lens to form a real image. 
A)  converging lens to form a real image. 
B)  converging lens to form a virtual image. 
C)  diverging lens to form a virtual image. 
D)  diverging lens to form a real image.

Question 18

A camera uses a:

Accepted Answer

A)  converging lens to form a real image. 
B)  converging lens to form an imaginary image. 
C)  diverging lens to form a real image. 
D)  diverging lens to form an imaginary image. 
A)  converging lens to form a real image. 
B)  converging lens to form an imaginary image. 
C)  diverging lens to form a real image. 
D)  diverging lens to form an imaginary image.

Question 19

The ciliary muscle is instrumental in changing the shape of which eye part?

Accepted Answer

A)  iris 
B)  lens 
C)  pupil 
D)  retina 
A)  iris 
B)  lens 
C)  pupil 
D)  retina

Question 20

Young children that need glasses are rarely prescribed bifocals.Why?

Accepted Answer

A)  They are almost always nearsighted. 
B)  They are almost always farsighted. 
C)  They have considerable accommodation power. 
D)  Parents don't go for the additional expense. 
A)  They are almost always nearsighted. 
B)  They are almost always farsighted. 
C)  They have considerable accommodation power. 
D)  Parents don't go for the additional expense.

Exam 25: Optical Instruments

A magnifying lens of power d (in diopters)gives what magnification when the viewing eye is relaxed assuming a near point of 25 cm?

You are designing eyeglasses for someone whose near point is 60 cm.What focal length lens should you prescribe so that an object can be clearly seen when placed at 25 cm in front of the eye?

Tripling the focal length of a telephoto lens,while holding aperture size constant,will change the light intensity admitted to the film by what factor?

A person's prescription for bifocals is -0.35 diopter for distant vision and +3.10 diopters for near vision,the near vision being accomplished by inserts into the distant vision lens.What is the net power of the near vision correction?

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

The Michelson interferometer can make precise length measurements using which of the following phenomena?

How many lines in a grating must be illuminated to obtain a resolving power of 400 in a fourth-order spectrum?

You are building a compound microscope with an objective lens of focal length 0.60 cm and an eyepiece lens of focal length 5.0 cm.You mount the lenses 18 cm apart.What is the maximum magnification of your microscope?

The "normal" eye has a near point of 25 cm.If a given individual's near point is 73 cm,for what problem will the eye doctor prescribe correction?

An individual's eye pupil changes from a diameter of 3.5 mm to 1.4 mm as the illumination is increased.By what factor does the minimum angle of resolution change?

If a person has hyperopia that person:

Glaucoma occurs because:

The Michelson interferometer is a device that may be used to measure:

The eye changes its f-number by:

A person has a near point of 40 cm and a far point of 1.0 m.When looking through lenses of focal length -1.0 m,what is the nearest an object can be to be seen clearly?

A fringe shift occurs for every ________ wavelength movement of the adjustable mirror in a Michelson interferometer.

A magnifier uses a:

A camera uses a:

The ciliary muscle is instrumental in changing the shape of which eye part?

Young children that need glasses are rarely prescribed bifocals.Why?

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