The distance from the front to the back of your eye is approximately 1.90 cm. If you can see a clear image of a book when it is 44.3 cm from your eye, what is the focal length of the lens/cornea system? Answer in units of cm.
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- A transparent photographic slide is placed in front of a converging lens with a focal length of 2.53 cm. An image of the slide is formed 12.0 cm from the slide. (a) How far is the lens from the slide if the image is real? (Enter your answers from smallest to largest starting with the first answer blank. Enter NONE in any remaining answer blanks.) cm cm (b) How far is the lens from the slide if the image is virtual? (Enter your answers from smallest to largest starting with the first answer blank. Enter NONE in any remaining answer blanks.) cm cm Need Help? Master ItYou have a lens whose focal length is −6.11 cm.−6.11 cm. You place an object on the axis of the lens at a distance of 11.1 cm11.1 cm from it. How far is the object's image from the lens? Enter the answer as a positive quantity.A prescription for reading glasses has a power of P = 2.42 D. What is the focal length of the lenses? (Units: cm)
- An object of height 7.91cm is placed 40 cm from a converging lens of focal length 11.1 cm. How big is the image? (hint: you should find the image distance first) To continue, enter your answer in cm. Round your answer to 1 decimal place.A lens forms an image of an object. The object is 16.0 cm from the lens. The image is 12.0 cm from the lens on the same side as the object. (a) What is the focal length of the lens? Is the lens converging or diverging? (b) If the object is 8.50 mm tall, how tall is the image? Is it erect or inverted? (c) Draw a principal-ray diagram.You have two lenses at your disposal, one with a focal length f1 = 44.0 cm, the other with a focal length f2 = -44.0 cm. If you want to produce an image of the bulb that is enlarged by a factor of 1.70, how far from the wall should the lens be placed? Express your answer with the appropriate units.
- Two converging lenses have the same focal length of 5.00 cm. They have a common principal axis and are separated by 29.5 cm. An object is located 10.0 cm to the left of the left-hand lens. What is the image distance (relative to the lens on the right) of the final image produced by this two-lens system? Final image distance = Number i UnitsA lens forms an image of an object. The object is 16 cm from the lens. The image is 12 cm from the lens on the same side as the object. (a) What is the focal length of the lens? (b) If the object is 8.5 mm tall, how tall is the image? Is it erect or inverted? (c) Draw a ray diagram.The widest cinema screen in the world was reportedly constructed in New Zealand in 2007. The screen is 30.6 meters (100 feet) wide. Images from a 35-mm wide film are projected onto this screen. Suppose that the screen in the theater is located a distance of 46 m from the projector. Determine the magnification of the image and the focal length of the lens system.
- A slide projector needs to create a 88-cmcm-high image of a 2.0-cmcm-tall slide. The screen is 340 cmcm from the slide. What focal length does the lens need? Assume that it is a thin lens. Express your answer with the appropriate units. Enter positive value if the lens is converging and negative value if the lens is diverging. How far should you place the lens from the slide? Express your answer with the appropriate units.In order to heighten your enjoyment of your 29 carat blue diamond, you view it through a lens held close to your right eye at an angular magnification of 5.1. The distance of your right eye's near point is 25 cm. What is the focal length f of the lens in centimeters? f = ?cmTwo lenses are mounted d = 39 cm apart on an optical bench. The focal length of the first lens is f1 = 9.8 cm and that of the second lens is f2 = 3.1 cm. An object of height ho = 4.9 cm is placed at a distance of do = 24 cm in front of the first lens. Now consider the two-lens system and the final image it forms, i.e., the image created by the second lens. What is the distance, in centimeters, between the object and its final image? D =?