does a reflector shield deflects granades if the granade lands on a reflector shield
does a reflector shield absorb the damage from the blast radius from a granade(or mine)
Question 1: Yes, the grenade will be reflected, or rather, bounced back to the robot that launched the grenade IF the attack came from the direction the reflector token is facing.
Question 2: You robot can avoid damage from a grenade or mine if the reflector token is placed in the correct direction. It does not really 'absorb' the damage, it is reflected. In the rare case that a robot was in the same space that a grenade had detonated and you were in an adjacent space with the reflector pointed toward the grenade, your robot would reflect the damage onto the adjacent robot.
I hope that helps.