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