1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
ArbitrLikvidat [17]
3 years ago
12

Sometimes a person cannot clearly see objects close up or far away. To correct this type of vision, bifocals are often used. The

top half of the lens is used to view distant objects and the bottom half of the lens is used to view objects close to the eye. A person can clearly see objects only if they are located between 34 cm and 180 cm away from his eyes. Bifocal lenses are used to correct his vision. What power lens (in diopters) should be used in the top half of the lens to allow him to clearly see distant objects
Physics
1 answer:
Alexxx [7]3 years ago
3 0

Answer:

The power of top half of the lens is 0.55 Diopters.

Explanation:

Since, the person can see an object at a distance between 34 cm and 180 cm away from his eyes. Therefore, 180 cm must be the focal length of the upper part of lens, as the top half of the lens is used to see the distant objects.

The general formula for power of a lens is:

Power = 1/Focal Length in meters

Therefore, for the top half of the lens:

Power = 1/1.8 m

<u>Power = 0.55 Diopters</u>

You might be interested in
The weight of the mass added to the hanger is equal to the extra force on the gas, but what area should we use to calculate the
kari74 [83]

Answer: according to the Avagadro's law, volume is directly propotional to no of moles: VXn

according to the Charles law, volume is directly propotional to  temperatue: VXT

according to the Boyle's law, volume is inversely propotional to P: VX1/P

when we combine them we get:

VXnT1/P

V=knT/P

k= R(universal gas constant)

V=RnT/P

PV=nRT  

8 0
3 years ago
To calculate acceleration you must know both the objects velocity and_____
amm1812

You need to know the time as well.

8 0
3 years ago
If the car speeds up at a steady 1.6 m/s2 , how long after starting is the magnitude of its centripetal acceleration equal to th
Rufina [12.5K]
Based on internet sources, <span>the basic formulas are: v^2/r = (at)^2/r = a ==> at^2 = r ==> t = sqrt(r/a). 
</span>
<span>Assuming the missing units are mutually compatible, as in the following example, they don't need to be known. </span>
<span>Acceleration = 1.6 cramwells/s^2 </span>
<span>Radius = 150 cramwells </span>
<span>t = sqrt(150/1.6) = 9.68 s.

I hope this helps.</span>
8 0
3 years ago
What single property was the most important in Jesseca’s material?
aleksandrvk [35]

Answer:

Jesseca wanted to create a material that reflected most of the light that fell on it.

Explanation:

Plato Answer

7 0
3 years ago
Read 2 more answers
Transfer of thermal or heat energy through "touch"
MaRussiya [10]
It is conduction. Rhejrjrjejehrhrhvrbrgr
4 0
3 years ago
Other questions:
  • action and reaction are equal in magnitude and opposite in direction then , why do not they balance each other​
    9·1 answer
  • When ____________________ equals the force of gravity on a falling object, the object reaches terminal velocity.
    8·1 answer
  • Two cars start a race with initial velocity 7ms-1 and 4ms-1 respectively.Their acceleration are 0.4ms-2 and 0.5ms-2 respectively
    12·1 answer
  • How to calculate kinetic energy of a projectile at the highest point of a projectile?
    10·2 answers
  • A tank has a gate that automatically opens if the water levelhis high enough. The gate has a squarecross section of side1m and c
    11·1 answer
  • If the atoms that share electrons have an unequal attraction for the electrons is called
    12·1 answer
  • Arrange the homeostasis process in the right sequence.
    10·1 answer
  • Three forces act on a flange as shown below. Determine the magnitude of the unknown force F (in lb) such that the net force acti
    11·1 answer
  • The learning about Universe is<br> called ________ ...​
    14·2 answers
  • Suppose the resistance of a copper wire is 1.05 N at 30°C.
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!