Which of the following describes how images are focused upon the retina?
*will mark brainlist*
a.
they are exactly as we see them.
b.
they are upside down and reversed left to right.
c.
they are only upside down.
d.
they are only reversed left to right.

Answer B: They are upside down and reversed left to right.

Explanation:

The ray trajectory through a thin lens is can be perfectly mapped with geometry which is normally a representation of an object (in most cases an arrow is used) and rays parallel to the optic axis then bending towards the focal point  and intercepting with rays that go straight through the lens' geometrical center.

Notice that if we are dealing with a circular lens like the one in the eyes, this ray trajectory will always give an inverted image independent of whether you are considering an upright object or an object that is horizontal. You just need to rotate the image-lens system 90 degrees so you can again draw the ray trajectories as before resulting on reversed images.

That is: the lens will always invert the image (from upright to pointing downwards, or from pointing right to pointing left). The lens will always  reverse the image.

diagram is missing, but i will try to explain your doubt.

answer:

amplitude is the maximum displacement or distance moved on a point of a vibrating body or wave measured from its equilibrium position.it is equal to half the length of vibration path.

elly's long hair:

a. if the salon only takes cash, then this isn't the problem. it doesn't matter how much she has in her checking account.   she can't get a haircut until she has the cash.

b. if she has overdraft protection, then there's no problem.   she can go ahead and write a check that her account can't cover, then sometime later, pay the bank some outrageous usury for loaning her a few bucks for a few days, but with beautiful hair.

c. if elly has some principles, and doesn't want to write a bad check, then now she has a problem.   her desire for the new hairstyle is in conflict with her honesty and integrity.

d.   if the bank will not process a check she writes, then even if she had a million $$ in her account, she couldn't use any of it.   the amount she has in her account is not the problem.   and if i may suggest, she might as well close her checking account, and put the money where it'll work for her.   it's not doing her a bit of good in a checking account, since she can't write any checks.

justin can't pay the full balance:

a. he can't even handle the credit limit he has now.   under no circumstances should he ask for a higher limit.

b.   he can ask for the grace period to be extended.   but that's no solution, the bank will almost certainly refuse anyway, and there are much better options.   he knew the rules of his credit card when he started using it.

c.   he definitely should pay the interest on the balance, plus as much of the balance as he can cover at the same time.

d.   he definitely should pay the minimum otherwise they could shut down his card.   he should also pay as much more as he possibly can.   he should also remember the awkward situation he's in, stop buying stuff on credit that he can't afford, and avoid adding any more debt.

i'd say that justin's best best option isn't on this list of choices.   what he has to do:   pay as much as he can at least the minimum payment plus as much more as he can and then avoid adding more debt.