A friend tells you that when she takes offher eyeglasses and holds them 23 cm above a printed page theimage of the print is erect but enlarged to 1.5 times its actual size. (a) Is the image real or virtual? How do you know? (b) What isthe focal length of your friend’s glasses? (c) Are the lenses in theglasses concave or convex? Explain
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A friend tells you that when she takes off
her eyeglasses and holds them 23 cm above a printed page the
image of the print is erect but enlarged to 1.5 times its actual size. (a) Is the image real or virtual? How do you know? (b) What is
the focal length of your friend’s glasses? (c) Are the lenses in the
glasses concave or convex? Explain
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- 1. An object is placed at the following distances from a convex lens of focal length 10 cm. (a) 8 cm (b)15 cm (c) 20 cm (d) 25 cm Which position of the object will produce (i) a diminished, real and inverted image? (ii) a magnified, real and inverted image? (iii) a magnified, virtual and erect image? (iv) an image of the same size as the object? U'S Justify your answer in each case.(a) For a converging lens with a focal length of 3.50 cm, find the object distance that will result in an inverted image with an image distance of 5.00 cm. diagram to verify your calculations. Use a ray (b) Is the image virtual or real? (c) What is the magnification?1) Calculate the magnification of the 36-in refractor at Lick Observatory on Mount Hamilton near San Jose, California. The focal lenght of the objective lens is 17.37m, and the focal lenght of the eyepiece is 22 mm. (Express your answer to three significant figures.) 2) What is the significance of the negative sign in the magnification equation? a) The image is inverted when viewed in the eyepiece. b) The image is upright when viewed in the eyepiece.
- To get a wide angle picture, you can change the lens on your camera to one with a different focal length. Should you use a lens with a longer or a shorter focal lengt The figure shows a pinhole camera photographing two arrows. (a) Which arrow will have the largest image? (b) Which image will be pointing up?An optometrist determines that a patient cannot clearly see any object that lies closer than 54.8 cm to the patient's eye. (a) Which of the following terms best describes this distance? O near point O magnification O far point O focal length (b) The patient needs to be able to clearly see objects that are just 27.0 cm distant. A contact lens is called for. What focal length (in cm) should this lens have? Assume the lens can be modeled as an ideal thin lens, which lies adjacent to the eye. cm (c) What is the power, P, of the contact lens (in diopters)? dioptersplease help asap
- An object is placed a distance of 7.02f from a converging lens, where f is the lens's focal length. (Include the sign of the value in your answers.) (a) What is the location of the image formed by the lens? d; = (b) Is the image real or virtual? O real O virtual (c) What is the magnification of the image? (d) Is the image upright or inverted? O upright O invertedHow far from a converging lens with a focal length of32 cm should an object be placed to produce a real imagewhich is the same size as the object?A positive lens has a focal length of 51 cm. An object is located at a distance of 2 cm from the lens. NOTE: This is a multi-part question. Trace three rays from the top of the object to confirm your results. (Please upload your response/solution).
- MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Your physics study partner is nearsighted. She has a near point of 50.0 cm from her eyes and she wears eyeglasses designed to allow her to read a newspaper held at a distance of 28.5 cm from her eyes. Determine the focal length of her glasses for each of the following cases. (a) She wears her eyeglasses 1.80 cm from her eyes. cm (b) She wears her eyeglasses 2.80 cm from her eyes. cmA friend tells you that when he takes off hiseyeglasses and holds them 23 cm above a printed page the imageof the print is erect but reduced to 0.67 of its actual size. (a) Is theimage real or virtual? How do you know? (b) What is the focallength of your friend’s glasses? (c) Are the lenses in the glassesconcave or convex? ExplainQuestion 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 Check