So they can know who it is going to . You cannot send an email without knowing who it goes to :)
Answer:
The last option is correct.
I believe the answer would be B, Sorry if I'm wrong! ❤
Answer:
Repetition.
Explanation:
hope it helps u
can u mark me as brainliest
Answer:
The phenomenon of total internal reflection of light is used in many optical instruments like telescopes, microscopes, binoculars, spectroscopes, periscopes etc. The brilliance of a diamond is due to total internal reflection. Optical fibre works on the principle of total internal reflection.
Explanation:
thank me later but if it wrong. sorry
