Assertion (A): A black hole is an astronomical entity that cannot be seen by telescope. Reason (R): The gravitational field on a black hole is so strong that it does not allow even light to escape. In the context of the above statements, which one of the following is correct?

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Assertion (A): A black hole is an astronomical entity that cannot be seen by telescope. Reason (R): The gravitational field on a black hole is so strong that it does not allow even light to escape. In the context of the above statements, which one of the following is correct?