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…
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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: 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: 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 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…
A: Have a look
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: 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…
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- A lens has a focal length of 31 cm and a diameter of 25.83 cm. What is the f-number of the lens?A farsighted man uses eyeglasses with a refractive power of 3.80 diopters. Wearing the glasses 0.025 m from his eyes, he is able to read books held no closer than 0.280 m from his eyes. He would like a prescription for contact lenses to serve the same purpose. What is the correct contact lens prescription, in diopters?A person sees clearly wearing eyeglasses that have a power of −2.00 diopters when the lenses are 2.30 cm in front of the eyes. (a) What is the focal length of the lens? cm(b) Is the person nearsighted or farsighted? nearsightedfarsighted (c) If the person wants to switch to contact lenses placed directly on the eyes, what lens power should be prescribed? diopters
- An individual is nearsighted; his near point is 11.0 cm and his far point is 51.0 cm. (a) What lens power is needed to correct his nearsightedness? 1.96 X The response you submitted has the wrong sign. diopters (b) When the lenses are in use, what is this person's near point? 11 X Your response differs from the correct answer by more than 10%. Double check your calculations. cmAn individual is nearsighted; his near point is 15.0 cm and his far point is 47.0 cm. (a) What lens power is needed to correct his nearsightedness? -2.13 diopters (b) When the lenses are in use, what is this person's near point? -0.469 x cmPlease Asap