Foundations of Virtual Reality Nptel Week 5 Answers
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Foundations of Virtual Reality Nptel Week 5 Answers (July-Dec 2025)
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Question 1. What is the term for the bending of light as it passes from one material into another?
a) Reflection
b) Absorption
c) Absorption
d) Refraction
e) Diffraction
f) None of the above
These are Foundations of Virtual Reality Nptel Week 5 Answers
Question 2. What is the diopter of a lens with a positive focal distance of f = 5 cm?
a) +0.2 D
b) +0.5 D
c) -0.2 D
d) -0.5 D
e) +20 D
f) None of the above
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.
a) simply multiplying
b) adding up
c) inverting
d) multiplying and then inverting
e) dividing by the focal length and adding up
f) None of the above
Question 4. Consider the following graph for spectral reflectance. What color will this object appear in daylight?
a) Blue-green
b) Green
c) Red
d) White
e) Mostly gray
f) None of the above
These are Foundations of Virtual Reality Nptel Week 5 Answers
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?
a) Chromatic
b) Spherical
c) Coma
d) Fresnel glare
e) Astigmatism
f) None of the above
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?
a) Chromatic
b) Spherical
c) Coma
d) Fresnel glare
e) Astigmatism
f) None of the above
Question 7. What is collimated light?
a) Light that is highly concentrated in a small area.
b) Light that is extremely bright and intense.
c) Light that is scattered in all directions.
d) Light in which the rays are parallel and do not diverge or converge.
e) Light that has a spectrum of colors.
f) None of the above.
These are Foundations of Virtual Reality Nptel Week 5 Answers
Question 8. How far should the source of light be from a converging lens to produce parallel rays coming out of the lens?
a) The source of light must be placed at an infinite distance from the lens.
b) The source of light should be positioned at a distance equal to the focal distance of the lens.
c) It doesn’t matter where the light source is placed; the lens always produces parallel rays.
d) The source of light should be as close to the lens as possible.
e) The source of light should be positioned beyond the focal point of the lens.
f) None of the above.
Question 9. Lenses in modern head-mounted displays enable users to focus on a display that is very close to their eyes by producing __________.
a) no distortions
b) collimated light
c) high FOV
d) a realistic and immersive experience
e) polarized light
f) None of the above
These are Foundations of Virtual Reality Nptel Week 5 Answers
Question 10. Which of the following statements is NOT true about spherical lenses commonly used in modern head-mounted displays?
a) Spherical lenses increase the FOV of the visual display.
b) Spherical lenses are easier and cheaper to manufacture than other types of lenses.
c) Spherical lenses do not produce distortions.
d) Spherical lenses magnify the objects on the display and make them appear infinitely far away.
e) Spherical lenses are typically made of transparent materials.
f) None of the above is a correct answer.
Question 11. Which of the following are not a problem commonly associated with lenses in modern HMDs?
a) Astigmatism
b) Spherical aberration
c) Fresnel glare
d) Chromatic aberration
e) Optical distortions
f) None of the above
These are Foundations of Virtual Reality Nptel Week 5 Answers
Question 12. Optical distortion occurs when straight lines appear curved after looking through the lens.
a) True
b) False
Question 13. What is the main cause of chromatic aberration?
a) Astigmatism of the lens.
b) Distortion of parallel lines.
c) White light is combined of different wavelengths.
d) Vergence-accommodation mismatch.
e) Binocular disparities.
f) None of the above.
These are Foundations of Virtual Reality Nptel Week 5 Answers
Question 14. In an HMDs virtual objects appear as if they are at infinity because:
a) The objects are extremely tiny and close to your eyes.
b) The objects are at an indeterminate distance, making them seem far away.
c) The objects are at a fixed distance, typically around 1 meter.
d) The objects are at varying distances, creating a 3D effect.
e) The eyes use no accommodation focusing on the objects.
f) None of the above.
Question 15. Why do young people who are farsighted usually not need glasses when using an HMD?
a) HMDs are specifically designed for farsighted individuals.
b) The virtual objects in HMDs are always placed at a close distance.
c) HMDs correct farsightedness automatically.
d) Farsighted individuals who have retained the ability to accommodate their eyes can focus on objects at varying distances, including objects at infinity.
e) HMDs incorporate eye tracking to adjust for farsightedness.
f) None of the above.
These are Foundations of Virtual Reality Nptel Week 5 Answers
Question 16. Why do nearsighted people typically need glasses when using an HMD?
a) HMDs are specifically designed for nearsighted individuals.
b) The virtual objects in HMDs are always placed at a far distance.
c) HMDs correct nearsightedness automatically.
d) Nearsighted individuals can never focus on objects at infinity.
e) HMDs provide variable focus for nearsighted users.
f) None of the above.
These are Foundations of Virtual Reality Nptel Week 5 Answers
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.
a) True
b) False
Question 18. Vergence is coupled with accommodation when observing virtual objects in HMDs.
a) True
b) False
These are Foundations of Virtual Reality Nptel Week 5 Answers
Question 19. Why is accommodation typically missing in an HMD?
a) HMDs lack the necessary sensors to measure accommodation.
b) Accommodation can be simulated in software, but it’s not a significant factor in depth perception.
c) HMDs are primarily designed for monocular vision, limiting accommodation cues.
d) HMDs intentionally omit accommodation to reduce eye strain.
e) The lack of accommodation in HMDs is typically due to the current technology limitations.
f) HMDs prioritize other depth cues over accommodation for a more immersive experience.
Question 20. What is VR vergence-accommodation mismatch, and why does it occur?
a) It is a deliberate design feature in VR to enhance realism.
b) VR vergence-accommodation mismatch is a rare occurrence and is not a significant concern.
c) It is when the eyes converge on a virtual object at one distance while the eyes’ lenses accommodate for a different distance, which is caused by collimated light emitted by the display.
d) It’s when the virtual world throws a surprise party for your eyes without your consent.
e) It happens when VR users wear glasses that are not suitable for the virtual environment.
f) None of the above.
These are Foundations of Virtual Reality Nptel Week 5 Answers