Question

In: Physics

1) A 6.47 mm high firefly sits on the axis of, and 11.5 cm in front...

1) A 6.47 mm high firefly sits on the axis of, and 11.5 cm in front of, the thin lens A, whose focal length is 6.11 cm . Behind lens A there is another thin lens, lens B, with a focal length of 20.7 cm . The two lenses share a common axis and are 61.5 cm apart. Is the image of the firefly that lens B forms real or virtual? What is the height of this image? Express the answer as a positive number (nm)?

image distance from lens B cm:

2)

One of the inevitable consequences of aging is a decrease in the flexibility of the lens. This leads to the farsighted condition called presbyopia (elder eye). Almost every aging human will experience it to some extent. However, for the myopic, or nearsighted, person it is possible that far vision will be limited by a subpar far point and near vision will be hampered by an expanding near point. One solution is to wear bifocal lenses that are diverging in the upper half to correct the nearsightedness and converging in the lower half to correct the farsightedness.

Suppose one such individual asks for your help. The patient complains that she can’t see far enough to safely drive (her far point dfar=114 cmd and she can’t read the font of her smart phone without holding it beyond arm’s length (her near point dnear=81.0 cm? Prescribe the bifocals that will correct the visual issues for your patient.

a)What is the focal length fns of the part of the bifocal lens that corrects the patient's nearsightedness?

b) What is the focal length ffsffs of the part of the bifocal lens that corrects the patient's farsightedness?

Solutions

Expert Solution


Related Solutions

A 6.09 mm high firefly sits on the axis of, and 11.7 cm in front of,...
A 6.09 mm high firefly sits on the axis of, and 11.7 cm in front of, the thin lens A, whose focal length is 5.63 cm Behind lens A there is another thin lens, lens B, with a focal length of 21.5 cm. The two lenses share a common axis and are 60.5 cm apart. Is the image of the firefly that lens B forms real or virtual? real virtual How far from lens B is this image located? Express...
A 6.35 mm high firefly sits on the axis of, and 14.1 cm in front of,...
A 6.35 mm high firefly sits on the axis of, and 14.1 cm in front of, the thin lens A, whose focal length is 5.03 cm. Behind lens A there is another thin lens, lens B, with a focal length of 25.7 cm. The two lenses share a common axis and are 61.5 cm apart. Is the image of the firefly that lens B forms real or virtual? real virtual How far from lens B is this image located? Express...
A 5.33-mm-high firefly sits on the axis of, and 11.1 cm in front of, the thin...
A 5.33-mm-high firefly sits on the axis of, and 11.1 cm in front of, the thin lens A, whose focal length is 5.13 cm. Behind lens A there is another thin lens, lens B, with focal length 28.1 cm. The two lenses share a common axis and are 57.9 cm apart. Is the image of the firefly that lens B forms real or virtual?How far from lens B is this image located (expressed as a positive number)?What is the height...
A 6.61-mm-high firefly sits on the axis of, and 14.1 cm in front of, the thin...
A 6.61-mm-high firefly sits on the axis of, and 14.1 cm in front of, the thin lens A, whose focal length is 5.21 cm. Behind lens A there is another thin lens, lens B, with focal length 21.1 cm. The two lenses share a common axis and are 60.3 cm apart. Is the image of the firefly that lens B forms real or virtual? How far from lens B is this image located (expressed as a positive number)? What is...
The inner surface of a 5 cm diameter, 3 mm thick, and 7 cm high styrofoam...
The inner surface of a 5 cm diameter, 3 mm thick, and 7 cm high styrofoam cup is at 70 °C. the outer surface is exposed to air at 20 °C. the surface heat transfer coefficient associated with the outer surface is 8 w/m2 °C. Determine The heat transfer rate through the cylindrical surface of the cup. The outer surface temperature of the cup.
An object 5 centimeters high is placed 15 cm in front of a converging lens with...
An object 5 centimeters high is placed 15 cm in front of a converging lens with focal length 5 cm. Using graph paper (turn the paper so that the long side is horizontal) and a straight edge, draw appropriate rays to locate the image. Chose a scale (tell me what it is!) such that the lens is in the center of the page and the object is near the left side of the page a. Is the image real or...
Problem 1) A 5 cm tall object is 20 cm in front of a diverging lens...
Problem 1) A 5 cm tall object is 20 cm in front of a diverging lens with a focal length of 10 cm. a) What is the location of the image? -6.67cm b) What is the height of the image? -1.67 cm c) The image is:virtual d) The image is:upright At 15 cm to the right of the lens in problem 1 we add a converging lens with a focal length of 10 cm. a) What is the location of...
Consider two charged particles that lay on the x-axis. Particle 1 (with charge +q) sits at...
Consider two charged particles that lay on the x-axis. Particle 1 (with charge +q) sits at location (d, 0, 0). Particle 2 (with charge -2q) sits at location (-d, 0, 0). Find the electric field as a function of the angle (θ) measured from the x-axis for all points in the x-y plane that are a distance (2d) away from the origin. (i.e. all the points on the circle with radius 2d).
A cube of side s = 2m sits 1 meter from the origin along the y-axis,...
A cube of side s = 2m sits 1 meter from the origin along the y-axis, as shown. An electric field E = Eo(1+ y/s) j passes through the cube, where Eo = 100 N/C. The charge enclosed in the cube is a) 6.20 nC b) 5.31 nC c) 4.43 nC d) 3.54 nC e) 0.00 nC
A 14 mm high object is 11 cm from a concave mirror with focal length 16...
A 14 mm high object is 11 cm from a concave mirror with focal length 16 cm. Calculate (a) the location of the image, (b) the height of the image, and (c) the type of image.
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT