They are unbalanced forces ..... Hope this helps :3
<span>Answer:
Using 1/f = 1/d' + 1/d ...(where d' object distance and d is image distance)
1/4 = 1/7 + 1/d
1/4 - 1/7 = 1/d
3/28 = 1/d
d = 28/3
d = 9.33 cm</span>
If Calcium lost two electrons, it would have the same number of electrons as Argon which has 18 electrons.
Light will make the object appear “broken” or in an irregular shape.
Refraction is the change in direction of waves.
Because it can pollute the air and cause wild life to eat stuff that has been contimanted by the air
