what is the refractive power for a pair of glasses with a focal length of 2.5 cm?
Q: The distance from the front to the back of your eye is approximately 1.90 cm. If you can see a clear…
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Q: The magnification produced by a converging lens is found to be 2.4 for an object placed 22 cm from…
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Q: A lens has a power +2.0 D. The type of lens and its focal length will be: A) Concave, -0.5 m B)…
A: The power of a lens is defined as the ability of the lens to bend the incident light from its…
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 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: An object is 17 cm in front of a diverging lens that has a focal length of -7.7 cm. How far in front…
A: Lens formula: This is an equation which gives the relation between focal length, object distance,…
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 converging lens has a focal length of 4.20 cm. It forms an inverted image with an image distance…
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Q: farsighted senior citizen needs glasses with a focal length of 45 cm. What is the power of the…
A: Given Focal length of lens, = F = 45 cm F = 0.45 m Power of the lens is ,P =???
Q: A camera lens used for taking close-up photos has a focal length of 11.8 mm. The farthest it can be…
A: Solution:- 1) The power of a lens is given by P = 1/f Here, P = Power of…
Q: 7. A farsighted man uses eyeglasses with a refractive power of 2.00 diopters. Wearing the glasses…
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Q: A single bi-convex lens (a lens with two convex surfaces) made of glass (index of refraction n =…
A: Lens work on the principle of refraction of light. The lens have their surrounding medium different…
Q: A very simplified model of the human eye is a single positive refractive surface with refractive…
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Q: A prescription for reading glasses has a power of P = 2.24 D. What is the focal length of the…
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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: This object is located 5.4 cm to the left of the lens, and the image forms at 24.8 cm to the right…
A: Given: The location of the object is 5.4 cm in front of the lens. The location of the image is 24.8…
Q: The near point of an eye is 38.0 cm. A corrective lens is to be used to allow this eye to focus…
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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 prescription for reading glasses has a power of P = 2.42 D. What is the focal length of the…
A: Given data: Power (P) = 2.42 D Required: Focal length in cm
Q: What is the power of a lens that has a focal length of -20 cm? +2.7 diopters O 4.0 diopters O 2.5…
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Q: A telescope has an angular magnification of -30 ×× and a barrel 1.05 mm long. What is the focal…
A: Given data: Angular magnification (m) = -30.Length of the barrel (L) = 1.05 mm = 1.05×10-3 m. To…
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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Q: 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: Given Data: The focal length of the lens is: f=31 cm The diameter of the lens is: d=25.83 cm The…
Q: An individual is nearsighted; his near point is 14.0 cm and his far point is 57.0 cm.What lens power…
A: Given Data: The person is nearsighted i.e. he can see things clearly that are close to him near…
Q: An object of height 3 cm is 47 cm in front of a lens of focal length -3 cm. Find the height of the…
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