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Gravitational lens - Quiz
Contributed by: Tucker
  • 1. What theory describes the amount of gravitational lensing?
A) Newtonian physics
B) Special relativity
C) Quantum mechanics
D) General theory of relativity
  • 2. Who is credited with first discussing the gravitational lens effect in print in 1924?
A) O. J. Lodge
B) Albert Einstein
C) Fritz Zwicky
D) Orest Khvolson
  • 3. What object was used to confirm the theory that galaxy clusters act as gravitational lenses?
A) A cluster of point particles
B) Twin QSO SBS 0957+561
C) The Milky Way
D) MACS J1149 Lensed Star 1
  • 4. Unlike an optical lens, what does a point-like gravitational lens have instead of a single focal point?
A) A focal sphere
B) A focal line
C) A focal plane
D) Zero focal points
  • 5. What is the appearance of a light source if it, the lens, and the observer are in a perfectly straight line?
A) A single point
B) An arc segment
C) Multiple images
D) A ring
  • 6. Which term is used to describe the ring appearance of a lensed source?
A) Zwicky circle
B) Einstein ring
C) Khvolson arc
D) Lodge loop
  • 7. In which class of lensing are distortions easily visible as rings, arcs, or multiple images?
A) Strong lensing
B) Point lensing
C) Weak lensing
D) Microlensing
  • 8. How are weak lensing distortions primarily detected?
A) Statistical analysis of many sources
B) Observation of single rings
C) Measuring a single bright image
D) By tracking time delays
  • 9. What can be reconstructed by analyzing the shear of a weak lensing field?
A) The exact age of the universe
B) Mass distribution
C) The speed of light
D) The focal length
  • 10. What phenomenon occurs in microlensing instead of shape distortion?
A) Multiple images
B) Creation of an Einstein ring
C) Change in light flux over time
D) Disappearance of the source
  • 11. What was the first star observed using the microlensing effect?
A) Icarus
B) Twin QSO
C) The Sun
D) Alpha Centauri
  • 12. Gravitational lenses affect which of the following?
A) Only radio waves
B) Only visible light
C) Only X-rays
D) All electromagnetic radiation
  • 13. When a strong lens produces multiple images, what can be observed between the paths?
A) A loss of mass
B) An increase in gravity
C) A relative time delay
D) A change in color
  • 14. Who originally argued that it was not permissible to say a solar gravitational field acts like a lens?
A) O. J. Lodge
B) Albert Einstein
C) Fritz Zwicky
D) Frantisek Link
  • 15. What is a primary goal of weak lensing surveys regarding cosmology?
A) Measuring the distance to the Moon
B) Finding new stars
C) Mapping the solar system
D) Improving the Lambda-CDM model
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