Why concave lens Diverges a light ray and why convex lens converges a light ray?

The beams of light travel with a speed of 3 * 10^8 m/s. Each is going towards either direction. So, from either axis of the two beams their speed is same but opposite in direction.

If you find out the relative velocity of one beam w.r.t. Other beam, then the sum is double the speed of light. But according to your question, you are asking whether the beams have double the speed of light, as said above, they will only move with 3 * 10^8 m/s.

But if you watch them, considering yours self to be moving with a beam with the same speed, thee speed will be defiantly double. But as physics says that the frame of reference must not change it's with time, you can't have a moving frame. Keeping your frame as the center of origin of the two beams, which is stationary, the net magnitude of velocity will be double the speed of light.

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