Recently the term ‘Gravitational Lensing’ has been in news, it is related to which of the following?

1
It occurs when gravity at the poles is greater than the Equator
2
It occurs when a huge amount of matter creates a gravitational field that distorts and magnifies the light from objects behind it.
3
It occurs when the gravitational field of the earth distorts and magnifies the light from objects in space.
4
It occurs when a huge amount of matter creates a gravitational field that demagnifies the light from objects opposite of it.

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