In Observations of a Double Quasar Image Produced by Gravitational

question 97

Multiple Choice

In observations of a double quasar image produced by gravitational lensing, fluctuations on the intensity of one image appear to be delayed compared with equivalent variations on the other image. Explain.

• A) Rotation of the lensing galaxy has delayed the beam of light on one side compared with the other because of the Doppler effect.
• B) One beam has had to pass through material with a greater refractive index than for the other beam within the lensing galaxy.
• C) The gravitational field of the lensing object slows down the light on one beam compared with the other.
• D) The path light takes through the gravitational lens to produce one image is longer than that for the other image.

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