Optometrists’ visits are complements for contact lenses. So,
Optometrists’ visits are complements for contact lenses. So,
Homework Answers
Optometrists' visits are complements for contact lenses. Therefore the cross price elasticity between optometry fee and sales of contact lenses will be negative. Because, when goods are complimentary, they have negative cross elasticity. That is, when price of one commodity increases, demand for the other good decreases. (Because both the commodities are compliments and are consumed together.)
Molds are used in the manufacture of contact lenses so that the lens material for proper...
Molds are used in the manufacture of contact lenses so that
the lens material for proper preparation and curing will be
consistent and meet designated dimensional criteria. Molds were
fabricated and a critical dimension measured for a sample of 15
randomly selected molds. (Data have been doubly coded to ensure
propriety.) Suppose the standard
deviation is known to be ? = 30.6
Find the 95% confidence interval for µ.
140 130 195 110 150 150 130 120 120 15 180...
10. Two lenses are in contact. One of the lenses has a focal length of +10.0cm...
10. Two lenses are in contact. One of the lenses has a focal length of +10.0cm when used ale When the two are in combination, an object 20.0cm away from the lenses forms a reali 40.0cm away from the lenses. What is the focal length of the second lens? Show your w 9. One lens has a focal length of +15.0 cm. A second lens of focal length +20.0cm is placed in contact with the first lens. What is the...
A farsighted boy has a near point at 0.5m and requires contact lenses to correct his...
A farsighted boy has a near point at 0.5m and requires contact lenses to correct his vision to the normal near point. What is the correct choice of lens power for the contact lenses? The answer is +6.0 diopters but I keep getting 2 so I'm not sure what I am doing wrong.
I am nearsighted and wear -2.25 diopter contact lenses for distance vision. without the contact lenses...
I am nearsighted and wear -2.25 diopter contact lenses for distance vision. without the contact lenses how far can I see? 0.22m 0.56m 0.33m 0.67m 0.44m In a single slit diffraction experiment, the wavelength of electrons is cut in half. Assuming that the angles are small, by what factor will the width of central bright spot change? It will become one quarter as large it will become two times as large It will become four times as large It will...
If 28% of the population of Statsville wears contact lenses, 37% have blue eyes, and 9%...
If 28% of the population of Statsville wears contact lenses, 37% have blue eyes, and 9% are blue-eyed people who wear contact lenses, what is the probability that a randomly selected resident has either blue eyes or contact lenses?
Two thin lenses of focal lengths 86 mm and -92 mm are placed in contact. What...
Two thin lenses of focal lengths 86 mm and -92 mm are placed in contact. What power must a third lens have so that when the three are in contact the combination has a focal length of -45 mm? ANS...... diopters
Two thin lenses, with focal lengths of 25.0 cm and -30.0 cm are placed in contact...
Two thin lenses, with focal lengths of 25.0 cm and -30.0 cm are placed in contact in an orientation so that their optic axes coincide. What is the focal length of the two in combination?
People commonly use contact lenses to correct their vision. A patient has a near point of...
People commonly use contact lenses to correct their vision. A patient has a near point of 150 cm and, to correct this, wears contact lenses with a focal length of 50 cm Part A What is the refractive power of her contact lenses? Part B How close can she hold a newspaper and still read it while wearing her contact lenses? Part C The indices of refraction for her contact lens, cornea, and the fluid behind her cornea are 1.6,...
When two thin lenses are in contact, the combination may still be considered as a thin...
When two thin lenses are in contact, the combination may still be considered as a thin lens. The focal distance of the combination, fc, is given by 1 1 1 + eq. (1) fcff2 where fi and f are the focal distances of the two lenses in contact. Assume two converging lenses (10 cm and 20 cm focal distances) are in contact and da = 15 cm. a) Calculate the image distance (d) and magnification (m.) for the combination. (2...
A brand of contact lenses is advertised as lasting an average of 19 months with a...
A brand of contact lenses is advertised as lasting an average of 19 months with a standard deviation of 2 months. A consumer group doubts that the mean is that high and recruits 59 volunteers to test the contact lenses. Let X represent the mean time that the lenses last for these volunteers. (a). Is X normally distributed? Explain your answer. (b). Find the mean of the sampling distribution of X. (c). Find the standard error of X. (d). Write...
Molds are used in the manufacture of contact lenses so that
the lens material for proper preparation and curing will be
consistent and meet designated dimensional criteria. Molds were
fabricated and a critical dimension measured for a sample of 15
randomly selected molds. (Data have been doubly coded to ensure
propriety.) Suppose the standard
deviation is known to be ? = 30.6
Find the 95% confidence interval for µ.
140 130 195 110 150 150 130 120 120 15 180...
10. Two lenses are in contact. One of the lenses has a focal length of +10.0cm when used ale When the two are in combination, an object 20.0cm away from the lenses forms a reali 40.0cm away from the lenses. What is the focal length of the second lens? Show your w 9. One lens has a focal length of +15.0 cm. A second lens of focal length +20.0cm is placed in contact with the first lens. What is the...
When two thin lenses are in contact, the combination may still be considered as a thin lens. The focal distance of the combination, fc, is given by 1 1 1 + eq. (1) fcff2 where fi and f are the focal distances of the two lenses in contact. Assume two converging lenses (10 cm and 20 cm focal distances) are in contact and da = 15 cm. a) Calculate the image distance (d) and magnification (m.) for the combination. (2...
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