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Gravitational lens - Quiz
Gravitational lens
  • 1. What theory describes the amount of gravitational lensing?
A) Special relativity
B) General theory of relativity
C) Quantum mechanics
D) Newtonian physics
  • 2. Who is credited with first discussing the gravitational lens effect in print in 1924?
A) Albert Einstein
B) Fritz Zwicky
C) O. J. Lodge
D) Orest Khvolson
  • 3. What object was used to confirm the theory that galaxy clusters act as gravitational lenses?
A) MACS J1149 Lensed Star 1
B) A cluster of point particles
C) The Milky Way
D) Twin QSO SBS 0957+561
  • 4. Unlike an optical lens, what does a point-like gravitational lens have instead of a single focal point?
A) A focal plane
B) Zero focal points
C) A focal sphere
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) Multiple images
B) A single point
C) An arc segment
D) A ring
  • 6. Which term is used to describe the ring appearance of a lensed source?
A) Einstein ring
B) Lodge loop
C) Khvolson arc
D) Zwicky circle
  • 7. In which class of lensing are distortions easily visible as rings, arcs, or multiple images?
A) Strong lensing
B) Microlensing
C) Weak lensing
D) Point lensing
  • 8. How are weak lensing distortions primarily detected?
A) Observation of single rings
B) Statistical analysis of many sources
C) By tracking time delays
D) Measuring a single bright image
  • 9. What can be reconstructed by analyzing the shear of a weak lensing field?
A) The focal length
B) Mass distribution
C) The speed of light
D) The exact age of the universe
  • 10. What phenomenon occurs in microlensing instead of shape distortion?
A) Change in light flux over time
B) Multiple images
C) Disappearance of the source
D) Creation of an Einstein ring
  • 11. What was the first star observed using the microlensing effect?
A) The Sun
B) Icarus
C) Alpha Centauri
D) Twin QSO
  • 12. Gravitational lenses affect which of the following?
A) All electromagnetic radiation
B) Only visible light
C) Only radio waves
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) An increase in gravity
C) A relative time delay
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) Frantisek Link
B) O. J. Lodge
C) Fritz Zwicky
D) Albert Einstein
  • 15. What is a primary goal of weak lensing surveys regarding cosmology?
A) Measuring the distance to the Moon
B) Mapping the solar system
C) Improving the Lambda-CDM model
D) Finding new stars
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