what is the refractive power for a pair of glasses with a focal length of 2.5 cm?
Q: A nearsighted woman has a far point of 220 cmcm . What refractive power should the lens have?…
A: A near sighted person can clearly see the nearby object but can't see far object clearly. These…
Q: In a model of the crystalline lens, the lens has a refractive index of 1.42 and the humors before…
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Q: A person decides to use an old pair of eyeglasses to make some optical instruments. He knows that…
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Q: A student has been prescribed glasses which have a concave lens of focal length 10 cm and a convex…
A: Given: The focal length of the concave lens is 10 cm. The focal length of the convex lens is 15 cm.
Q: Double-convex lenses are to be manufactured from a glass of refractive index 1.55, with both faces…
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Q: A 7.5x binocular produces an angular magnification of -7.50, acting like a telescope. (Mirrors are…
A: Given: The focal length of the objective lenses of the binocular is 75.0 cm. The magnification of…
Q: A person has a far-point of 30 m and a near-point of 43 cm. Assume a distance of 2.5 cm between the…
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Q: To study the physical features of Hydra viridis, a student uses a compound microscope with a…
A: Magnifying power compound microscope(M) = 416Focal length of eyepiece =1.2cmTube…
Q: A farsighted man uses contact lenses with a refractive power of 1.95 diopters. Wearing the contacts,…
A: Power of lens = 1.95 diopters distance of nearest book which the man can read = 0.25 m
Q: A moth has eyes that are made of a thin lens of focal length f=5.00 cm and index of refraction…
A: f=5.00 cmn=1.52R1 = +1.3 cm, R2 = –5.0 cmR1 = –2.6 cm, R2 = ∞R1 = –1.3 cm, 1 R = –5.0 cmR1 = +2.6…
Q: Suppose you take a magnifying glass out on a sunny day and you find that it concentrates sunlight to…
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Q: A thin convex lens of focal length 5 cm is used as a simple microscope by a person with normal near…
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Q: What is the focal length, and optical power (in dipoters) of the lenses used to produce the…
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Q: The radii of curvature of a convex lens are 15 cm and 10 cm. If the refractive index be 1.5 cm,…
A: Given data: - The radius of convex lens is R1 = 15 cm. The radius of a convex lens is R2 = -10 cm.…
Q: A diverging lens has a focal length of 21.8 cm. An object 2.67 cm in height is placed 109 cm in…
A: (given) Focal length (f) of diverging lens = -21.8 cm Height (h) of an object = 2.67…
Q: a far sighted person has a near point of 98 cm. to correct their vision so they can see objects…
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Q: A very simplified model of the human eye is a single positive refractive surface with refractive…
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Q: Suppose a lens is placed in a device that determines its power as 2.99 diopters. (a) Find the focal…
A: Given, Power of lens = 2.99 diopter Patient's near point =? We need to find, (a) Focal length of…
Q: A converging lens made of a material with refractive index of n = 1.49. The magnitude of the radii…
A: given data n=1.49 magnitude of the radii of curvature of its surface are 10 cm and 20 cm what is the…
Q: A spherical thin lens is made of glass with a refractive index of 1.500. The radii of curvature are…
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Q: A thin plastic lens with index of refraction n = 1.71 has radii of curvature given by R, = -10.0 cm…
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Q: A leopard is at a distance of 18 m from a converging lens of focal length 38 cm. The lens forms an…
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Q: a student is reading a lecture written on a blackboard. the lenses in her eyes have a refractive…
A: Step 1: Step 2: Step 3: Step 4:
Q: You are designing contact lenses for someone whose near point is 65 cm. What focal length lens…
A: Consider the near point, that is the distance of the image be v, the object’s distance be u, and the…
Q: You are designing contact lenses for someone whose near point is 75 cm. What focal length lens…
A: Using lens formula,
Q: A near sighted person has a far-point of 3.68 m. to correct their vision, what should the focal…
A: Far point, D = 3.68 m Lens distance, d = 2 cm Focal length, f = ?
Q: A far-sighted person has a near point of 1.0 m. What prescription glasses are needed to correct her…
A: The spectacle lens must create a image 1.00 m (the near point) distant when an object is held 25.0…
Q: A farsighted man uses eyeglasses with a refractive power of 1.90 diopters. Wearing the glasses 0.030…
A: Given: Glass power = 1.90 D Glass distance from the eye = 0.030 m Find: Power of the…
Q: A camera is equipped with a lens with a focal length of 39 cm. When an object 2.2 m (220 cm) away is…
A:
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