When viewing an object closer than 20 feet, all of the following processes occur except a. the eyes accommodate to focus on the close-up object. b. the ciliary body contracts, so the suspensory ligaments become less taut. c. the lens becomes more rounded to better refract light rays. d. the pupils dilate to let in more light for the retina.
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When viewing an object closer than 20 feet, all of the following processes occur except
a. the eyes accommodate to focus on the close-up object.
b. the ciliary body contracts, so the suspensory ligaments become less taut.
c. the lens becomes more rounded to better refract light rays.
d. the pupils dilate to let in more light for the retina.
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- If a single lens forms a virtual image of an object, then Group of answer choices The image must be inverted. The lens could be either a diverging or a converging lens. The lens must be a diverging lens. The lens must be a converging lens.Activity 1. Use ray diagrams to find the image position and magnification for an object at each of the following distances from a converging lens with a focal length of 20 cm: (a) 20 cm; (b) 15 cm; 2. A beam of parallel rays spreads out after passing through a thin diverging lens, as if the rays all came from a point 40.0 cm from the center of the lens. You want to use this lens to form an erect, virtual image that is the 1/3 height of the object. (a) Where should the object be placed? Where will the image be? (b) Draw a principal- ray diagram.Which of the following scenarios does NOT result in refraction? a. The light must enter the medium parallel to the normal. b. Both the incident and refracting media must be transparent. C. The light must enter the medium at an angle > 0° with respect to the normal. d. Both substances must have different indices of refraction
- 2. Show that the minimum distance between a real object and its real image given by a convergent lens of focal length f is 4f. Get q as a function of p from 1/p + 1/q = 1/f. Take the derivative of s = p +q to find the value of p for which s is minimum.Which of the following is not a problem for refracting telescopes? O A. Different wavelengths of light are focused at slightly different locations. O B. The quality of the glass lens in transparency and in the shape of both surfaces must be high. C. The secondary mirror blocks some of the light passing through the primary lens. D. The primary lens can only be supported at the edges making deformation of large lenses difficult to avoid.1. The of light can change when light is refracted because the medium changes. A. frequency 1 Pt B. color ABc E D C. speed D. transparency 2. Light is not refracted when it is A. traveling from air into a glass of water at an angle of 35° to the normal. B. traveling from water into air at an angle of 35° to the normal. 1 Pt C. striking a wood surface at an angle of 75°. D. traveling from air into a diamond at an angle of 45°. A B E 3. When light passes at an angle to the normal from one material into another material in which its speed is higher, A. it is bent toward the normal to the surface. 1Pt B. it always lies along the normal to the surface. C.itis unaffected. D. it is bent away from the normal to the surface. A B D E
- 1. Consider a cuboid made of crown glass which has inner space filled with water. A ray of light is incident onto the 10 cm thick block of glass on the top face of the cuboid at 60◦ from the normal. It then meets the glass-water boundary and is refracted again and continues through a water thickness of 5 cm before reaching another water-glass boundary. The ray of light is again refracted and continues in the 10 cm thick block of glass on the base of the cuboid and eventually exits into air. (a) Draw a clearly labelled diagram of the path the ray of light takes. (b) Calculate all the angles of refraction and incidence at each boundary. (c) Calculate the optical path of the ray of light from the point it is incident on the surface of the cuboid to the point it exits into air on the other end.5. Consider a converging lens that has a focal length (f). Which one of these is correct about the image when the object is placed in front of the lens at a distance of (3f)? The image is real, inverted, and diminished The image is real, erect, and diminished The image is real, erect, and magnified The image is virtual, inverted, and magnified The image is virtual, inverted, and diminished The image is virtual, erect, and has the same size as the object A nearsighted man uses his ideally prescribed eyeglasses that have a refractive power of -3.00 diopters. He would like a prescription for contact lenses. What is the correct contact lens prescription if he normally wears his eyeglasses a distance of 2.1 cm from his eyes? dioptersCreate a ray diagram for eyeglasses that contain a diverging lens. Assume you are looking at a 2 cm tall object that is 4 cm from the lens. The focal length is 3 cm. What type of vision are they used to correct? Give both names. How do they do this? Explain.
- 6. If you open your eyes underwater, you do not get a well-focused image on your retina. But if you wear goggles or a mask, you will see normally. Explain why this is the case.2. An object is 1 meter above the surface of water. You are underwater, looking straight up toward the object. How far (express in meters) above the air-water interface does the object appear to be? Use a small-angle approximation for Snell's law. Draw a diagram showing your reasoning.If the eyepiece of a telescope is replaced with an eyepiece with a focal length twice as long, the magnifying power is a. four times greater. b. two times greater. c. four times less. d. two times less.