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A person can focus clearly only on objects between 33.5 cm and 51.5 cm from his eyes. Find the focal lengths of the correcting contact lenses needed to correct his closeup vision and distant vision. Find the powers of the correcting contact lenses needed to correct his closeup vision and distant vision. Answer in the order indicated. Separate your answers with a comma. You want to view an insect 2.20 mm in length through a magnifier. If the insect is...
(a) What is the maximum angular magnification of an eyeglass lens having a focal length of 19.6 cm when used as a simple magnifier? (b) What is the magnification of this lens when the eye is relaxed?
The focal length of a lens is 4.5 cm. Calculate the maximum angular magnification of a simple magnifier when the image is formed at the normal near point of the eye.
The focal length of a lens is 4.6 cm. Calculate the maximum angular magnification of a simple magnifier when the image is formed at the normal near point of the eye.
This is a two part question. Part 1. To look closely at a small object, such as an insect or a crystal, you bring it close to your eye, making the subtended angle and the retinal image as large as possible. But your eye cannot focus sharply on objects that are closer than the near point, so the angular size of an object is greatest when it is placed at the near point (25 cm away from a “normal” eye)....
A stamp collector uses a lens with 7.2-cm focal length as a simple magnifier. The virtual image is produced at the normal near point (25 cm). (a) How far from the lens should the stamp be placed? ____cm (b) What is the expected angular magnification?
The distance between the lenses in a compound microscope is 18 cm. The focal length of the objective is 1.5 cm. If the microscope is to provide an angular magnification of -88 when used by a person with a normal near point (25 cm from the eye), what must be the focal length of the eyepiece?
The distance between the lenses in a compound microscope is 18 cm. The focal length of the objective is 1.5 cm. If the microscope is to provide an angular magnification of -64 when used by a person with a normal near point (25 cm from the eye), what must be the focal length of the eyepiece?
10. An astronomical telescope uses an eyepiece of power +62.5 D. What is the power of the objective if its angular magnification - 75.0x? (b) A Galilean telescope adjusted for a relaxed eye is 33.75 cm long. Find the magnification if the focal length of the objective is 36.00 cm
Background information A person with normal vision can focus on objects as close as a few centimeters from the eye up to objects infinitely far away. There exist, however, certain conditions under which the range of vision is not so extended. For example, a nearsighted person cannot focus on objects farther than a certain point (the far point), while a farsighted person cannot focus on objects closer than a certain point (the near point). Note that even though the presence...