# Lovelace

Termbank
1. C
1. Course Schedule
2. L
1. Lecture Slides
3. O
1. Oculus Best Practices Guide
4. U
1. Unity
Platform
5. V
1. Virtual Reality, LaValle 2016
6. Y
1. YouTube Lectures: VR Systems and Humans
Content
Completed: / exercises

# QUIZ: Light and Optics¶

Due date: .

## Topics¶

• Three interpretations of light
• Refraction
• Simple lenses
• Diopters
• Imaging properties of lenses
• Lens aberrations
• The human eye optical system
• Vergence-accommodation mistatch in HMDs
• A simplified HMD model

## Assumptions¶

In all of the questions in this quiz, unless otherwise stated, assume a person with no vision defects and a simplified model of an HMD as discussed in class.

Leave any comments about the questions below here. For example, if any of the questions seem unfair, or confusing. This is not a graded question, you don't have to write answers here.

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## Question 1¶

What is the term for the bending of light as it passes from one material into another?
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## Question 2¶

What is the diopter of a lens with a positive focal distance of f = 5 cm?
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## Question 3¶

Diopters are a convenient way to quantify optical power because they allow one to calculate the optical power of a system of lenses by __________________ the diopters of all lenses in the system.
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## Question 4¶

Consider the following graph for spectral reflectance. What color will this object appear in daylight?
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## Question 5¶

Think about a laser emitting red light rays in 3 dimensions which pass through a spherical lense. If the rays have one focal point in one plane, and a different focal point in another plane, what type of optical aberration is it?
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## Question 6¶

Think about white light rays propagating in 3 dimensions and passing through a spherical lense. If the rays have multiple focal points depending on the wavelength, what type of optical aberration is it?
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## Question 7¶

What is collimated light?
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## Question 8¶

How far should the source of light be from a converging lens to produce parallel rays coming out of the lens?
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## Question 9¶

Lenses in modern head-mounted displays enable users to focus on a display that is very close to their eyes by producing __________.
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## Question 10¶

Which of the following statements is NOT true about spherical lenses commonly used in modern head-mounted displays?
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## Question 11¶

Which one of the following is NOT a problem commonly associated with spherical lenses in modern HMDs?
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## Question 12¶

Optical distortion occurs when straight lines appear curved after looking through the lens.
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## Question 13¶

What is the main cause of chromatic aberration?
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## Question 14¶

In an HMDs virtual objects appear as if they are at infinity because:
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## Question 15¶

Why do young people who are farsighted usually not need glasses when using an HMD?
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## Question 16¶

Why do nearsighted people typically need glasses when using an HMD?
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## Question 17¶

Human eyes adjust their focus (accomodation) to see real-life objects at different distances, but in VR, the focus is typically fixed, and accommodation does not occur.
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## Question 18¶

Vergence is coupled with accommodation when observing virtual objects in HMDs.
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## Question 19¶

Why is accommodation typically missing in an HMD?
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## Question 20¶

What is VR vergence-accommodation mismatch, and why does it occur?
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# Authors¶

Anna LaValle.
?
Lectures and labs schedule for the VR Systems and Humans course, Fall 2023
Lecture slides, VR Systems and Humans course, University of Oulu, 2023