+ Rays O Margina Pinopal 20000 Many None Radus of Curvature 0 100 120 140 160 180 200 220 Index of Refraction Diameter Don Focal Poiarts (O Virtual Image Labels Second Point Select the Principle rays (bottom menu) and Ruler (You will physically move the ruler to the simulation). Click on the "change object" until you see an pencil as the object. Note down the following parameters: Curvature Radius:..... Refractive index:.. Diameter:.... The horizontal axis through the center of the lens is called the principle axis. The pencil on the left hand side is your object and the image is appearing on the right hand side. Move the Object (pencil), so the eraser of the pencil lay on to the principle axis.

+ Rays O Margina Pinopal 20000 Many None Radus of Curvature 0 100 120 140 160 180 200 220 Index of Refraction Diameter Don Focal Poiarts (O Virtual Image Labels Second Point Select the Principle rays (bottom menu) and Ruler (You will physically move the ruler to the simulation). Click on the "change object" until you see an pencil as the object. Note down the following parameters: Curvature Radius:..... Refractive index:.. Diameter:.... The horizontal axis through the center of the lens is called the principle axis. The pencil on the left hand side is your object and the image is appearing on the right hand side. Move the Object (pencil), so the eraser of the pencil lay on to the principle axis.

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter26: Vision And Optical Instruments

Section: Chapter Questions

Problem 8PE: (a) A laser vision correction reshaping the cornea of a myopic patient reduces the power of his eye...

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A patient cant see objects closer than 40.0 cm and wishes to clearly see objects that are 20.0 cm from his eye. (a) Is the patient nearsighted or farsighted? (b) If the eye-lens distance is 2.00 cm, what is the minimum object distance p from the lens? (c) What image position with respect to the lens will allow the patient to see the object? (d) Is the image real or virtual? Is the image distance q positive or negative? (e) Calculate the required focal length. (f) Find the power of the lens in diopters. (g) If a contact lens is to be prescribed instead, find p, q, and f and the power of the lens.
Figure P35.20 (page 958) shows a curved surface separating a material with index of refraction n1 from a material with index n2. The surface forms an image I of object O. The ray shown in red passes through the surface along a radial line. Its angles of incidence and refraction are both zero, so its direction does not change at the surface. For the ray shown in blue, the direction changes according to Snells law, n1 sin 1 = n2 sin 2. For paraxial rays, we assume 1, and 2 are small, so we may write n1 tan 1 = n2 tan 2. The magnification is defined as M = h/h. Prove that the magnification is given by M = n1q/n2p. Figure P35.20
The accommodation limits for a nearsighted persons eyes are 18.0 cm and 80.0 cm. When he wears his glasses, he can see faraway objects clearly. At what minimum distance is he able to see objects clearly?
(a) A laser vision correction reshaping the cornea of a myopic patient reduces the power of his eye by 9.00 D, with a 5.0 uncertainty in the final correction. What is the range of diopters for spectacle lenses that this person might need after LASIK procedure? (b) Was the person nearsighted or farsighted before the procedure? How do you know?
Suppose you want to use a converging lens to project the image of two trees onto a screen. As shown in Figure CQ26.7, one tree is a distance x from the lens and the other is at 2x. You adjust the screen so that the near tree is in focus. If you now want the far tree to be in focus, do you move the screen toward or away from the lens?
Q2: The radius of curvature for outer part of the cornea is (8 mm), the inner portion is relatively flat. If the index of refraction of the cornea and the aqueous humor is (1.34), find the power of the cornea?
Help 1-A camera's f-number is increased from 1.4 to 2.8. By what factor is the light entering the camera (the aperature) changed, assuming the shutter speed is unchanged? A) Increased by a factor of 4 B) Increased by a factor of 2 C) Decreased by a factor of 4 D) Decreased by a factor of 2 2- Which of the following statements is true about an eye that is farsighted? A) The image is in back of the retina, and this can be corrected by a diverging lens. B) The image is in back of the retina, and this can be corrected by a converging lens. C) The image is in front of the retina, and this can be corrected by a converging lens. D) The image is in front of the retina, and this can be corrected by a diverging lens.
Refraction And Images Formed By Refraction A Lucite slab (n = 1.485) 5.00 cm in thickness forms the bottom of an ornamental fish pond that is 40.0 cm deep. If the pond is completely filled with water, what is the apparent thickness of the Lucite plate when viewed from directly above the pond? Why this problem ans is 3.34,not 3.367 Why can't 5/1.845=3.367
A nearsighted person cannot see objects clearly beyond 2 m (the far point). If the patient has no astigmatism and contact lenses are prescribed, what is the power of the lens required (in diopters) to correct the patient's vision?
1) What is the far point of a person whose eyes have a relaxed power of 50.5D? b) what is the near point of a person whose eyes have an accommodated power of 53.5D? (Use retina-to- lens distance 1.8cm)
An object is located at 2 cm from the lens with optical power of 10 D. What is the distance between the lens and the image? Draw the ray tracing, the image and characterize it.
You wish to produce upright virtual images of an object with the given magnifications using a diverging lens. Where must you place the object in each case (express your answer in terms of the focal length of the lens)? (a) M = 0.5 (b) M = 0.75 A person with a normal lens-to-retina distance wears contact lenses with an optical power of 1.54 D in order to be able to clearly see objects 20 cm in front of them. (a) What kind of vision defect does this person have? (b) What is this person’s near point (without the contact lenses)?