Examples 9.1. Calculate the focal lengths of the crown and flint glass lenses that fom achromatic doublet of focal length 50 cm when placed in contact. The refractive indices for and F lines are given below: Hc =1.515 Hc =1.644 Crown %3D Hp=1.523 Flint Hp = 1.664
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- A contact lens is made of plastic with an index of refraction 1.50. The lens has an outer radius of curvature of + 1.65 cm and an inner radius of curvature of + 5.85 cm. What is its focal length? TTTT Paragraph Arial 3 (12pt) E - E - T- 回i 公 T T, Bullet List O f. Mashups- HTML CSSAn antelope is 20.0 m from a converging lens with a focal length of 30.0 cm. The lens forms an image of theanimal. If the antelope runs away from the lens at a speed 5.00 m/s, how fast is the image moving? Does the imagetoward or away from the lens?Problem 102. My wife Margie has lost most of her accommodation. She has a nearpoint of 130 cm and would like to read as close as 40 cm from her eyes. A) What power reading glasses should Margie use? Assume the lenses in the glasses are 2 cm from the eye. B) What is Margie's farpoint while wearing reading glasses?
- An eyeglass prescription that specifies a power of -1.0 diopters is describing a lens that has a focal length of O a. + 1 meter O b.- 100 cm O C. - 1 meter O d. - 1 cm An object placed 25 cm to the left of a +20 cm focal length lens produces a real image 100 cm to the right of the lens. What is the magnification? O a. - 4 Ob. - 0.25 O C. + 2 O d. - 18. A nearsighted man uses his ideally prescribed eyeglasses that have a refractive power of -2.50 diopters. He would like a prescription for contact lenses. What is the correct contact lens prescription if he normally wears his eyeglasses a distance of 3.0 cm from his eyes? diopters oof6. A nearsighted man uses his ideally prescribed eyeglasses that have a refractive power of -3.00 diopters. He would like a prescription for contact lenses. What is the correct contact lens distance of 2.0 cm from his eyes? diopters ssf60 ss prescription if he normally wears his eyeglasses a f60 ssf60 pre 0 ssf60 sta
- A converging lenses made of a certain glass with focal length of 30 cm is shown. R1 refers to the magnitude of the radius of the surface on the left and R2 on the right. What is the index of refraction of the glass? R1 = 50 cm Re 3 75 сm O A. 4.5 О В. 5.0 О С. 6.0 O D. 7.5plz answer in details, thanksWhich of the following changes would increase the focal length of a lens? O increase index of refraction of lens material. O increase radius of curvature of surface. O decrease radius of curvature of surface. use red colored lens material.
- Question 1 A diverging lens has a focal length of 10 cm. An object is placed at a Not complete distance of 15 cm to the left of the lens. What is the image position? Marked out of 10.00 Select one: P Flag 10 cm to the left of the lens а. question O b. 6 cm to the left of the lens О с. 6 cm to the right of the lens O d. 15 cm to the left of the lens е. 15 cm to the right of the lens Checkq42 Mr ASHER is a nearsighted person, who has a far point of 29.0 cm. Calculate the refractive power (in D) needed for his contact lenses. Enter the numerical part of your answer to two decimal figures. Hint: Remember that the sign of the refractive power is significant.Molly has a near point at 45 cm and requires eyeglasses to correct her vision. - What should be the prescription (i.e. the lens power) for her eye? Note: Corrective lenses are available in increments in power of 0.25 diopters, e.g. +1.0, +1.25, +1. 50,...,etc. (Answer must be divisible by 0.25 and the lenses should have the lowest power for which the new near point with the lens is no further than 25 cm) - A 9.0 mm base curve (i.e. radius of curvature) will best fit her cornea. Using the material with index of refractive 1.422, what should be the radius of curvature for the other side of the lens? - What is the new far point after wearing the contact lens.