Different kinds of lenses are used in eyeglasses to help people with eye conditions. Farsightedness is an eye condition in which distant objects appear clear but close objects appear blurry. Nearsightedness is an eye condition in which close objects appear clear but distant objects appear blurry.

Which best describes the type of lens that would help someone with one of these eye conditions?

Concave lenses would help someone who is nearsighted because the lenses make objects look smaller and closer.
Concave lenses would help someone who is farsighted because the lenses make objects look smaller and closer.
Convex lenses would help someone who is nearsighted because the lenses can make objects look smaller and closer.
Convex lenses would help someone who is nearsighted because the lenses can make objects look larger and farther away.

the answer is A.) or Concave lenses would help someone who is nearsighted because the lenses make objects look smaller and closer

CONCAVE LENSES WOULD HELP SOMEONE WHO IS NEARSIGHTED BECAUSE THE LENSES MAKE THE OBJECT LOOK SMALLER AND CLOSER.

Explanation:

Correct on 3dg3 2020

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation: