Doubling a number is equivalent to multiplying by 2.

Doubling twice (doubling, and then doubling the result again) is equivalent to multiplying by 4.

(Also, doubling three times is the same as multiplying by 8, doubling 4 times is the same as multiplying by 16, etc.)

No, doubling the angle of incidence itself will not cause a doubling of the angle of refraction.

I'm not completely sure but I think it's like this. Doubling 1 would be 2. Doubling 2 would be 4. Doubling 4 would be 8. Doubling 8 would be 16. Doubling 16 would be 32. Doubling 32 would be 64. (<-- Your answer) ?

Doubling the radius quadruples the volume.

Doubling Point Light was created in 1898.