Question

The single largest uncertainty in the measurement of the Hubble constant using gravitational lenses comes from uncertainty of...

* the distance to the lensing cluster or galaxy.

* the mass distribution of the lensed quasar.

* the distance to the lensed quasar.

* the mass distribution of the lensing cluster or galaxy.

Answer 1

I know that this is a question from one of the quizzes to S. George Djorgovski in Coursera, so nice try. Try slide 13 in module 4.5 of that course and you should find the answer there