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 35 cm and
200 cm away from her eyes. Bifocal lenses are used to correct her
vision.
What power lens (in diopters) should be used in the bottom half of
the lens to allow her to clearly see objects 25 cm away?
Using lens formula,
1/f = 1/v + 1/u
1/f = 1/25 - 1/35
f = 87.5 cm
Power, P = 100/87.5 = 1.14 D
Comment in case any doubt please rate my answer ....
Sometimes a person cannot clearly see objects close up or far away. To correct this type...
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 36 cm and 160 cm away from her eyes. Bifocal lenses are used to correct her vision. What...
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 35 cm and 200 cm away from her eyes. Bifocal lenses are used to correct her vision. What...
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 33 cm and 176 cm away from her eyes. Bifocal lenses are used to correct her vision. What...
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 33 cm and 174 cm away from her eyes. Bifocal lenses are used to correct her vision. What...
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 44 cm and 194 cm away from his eyes. Bifocal lenses are used to correct his vision. What...
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 40 cm and 198 cm away from his eyes. Bifocal lenses are used to correct his vision. What...
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