The Moon has an angular size of 0.50° when viewed with unaided vision from Earth. Suppose the Moon is viewed through a telescope with an objective whose focal length is 175 cm and an eyepiece whose focal length is 35 mm. What is the angular size of the Moon as seen through this telescope?
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The Moon has an angular size of 0.50° when viewed with unaided vision from Earth. Suppose the Moon is viewed through a telescope with an objective whose focal length is 175 cm and an eyepiece whose focal length is 35 mm. What is the angular size of the Moon as seen through this telescope?
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- Martha is viewing a distant mountain with a telescope that has a 120-cm-focal-length objective lens and an eyepiece with a 2.0 cm focal length. She sees a bird that's 42 m distant and wants to observe it. To do so, she has to refocus the telescope. By how far must she move the eyepiece in order to focus on the bird? Express your answer to two significant figures and include the appropriate units. In which direction must she move the eyepiece in order to focus on the bird? A. toward the objective B. away from the objective C. She doesn't need to move the eyepiece. D. None of the above.A person focusses on a page of text held 40.0 cm away from their eye. A character is 0.3 cm tall. Calculate the height of the character on the retina, and the focal length of the lens. You can assume that the eyeball is 2.0 cm in diameter. Optics of the Human Eye Overlay Eye Anatomy Retina Fovea centralis Optic Nerve Central retinal v. Superior rectus m Ora serrata Cillary body Vitreous Bode Lens Inferior rectus m Posterior chamber Anterior Chamber Comea Zonules Sclera Object Far Near Focus Normal Vision Near Sighted Object Position Far Sighted Near Needs Bifocals FarIt is your first day at work as a summer intern at an optics company. Your supervisor hands you a diverging lens and asks you to measure its focal length. You know that with a converging lens, you can measure the focal length by placing an object a distance ss to the left of the lens, far enough from the lens for the image to be real, and viewing the image on a screen that is to the right of the lens. By adjusting the position of the screen until the image is in sharp focus, you can determine the image distance s′s′ and then use the equation 1s+1s′=1f1s+1s′=1f, to calculate the focal length ff of the lens. But this procedure won't work with a diverging lens−−by itself, a diverging lens produces only virtual images, which can't be projected onto a screen. Therefore, to determine the focal length of a diverging lens, you do the following: First you take a converging lens and measure that, for an object 20.0 cmcm to the left of the lens, the image is 29.7 cmcm to the right of the lens.…
- Q1 a) The eyepiece of a refracting telescope has a focal length of 9.00cm. The distance between objective and eyepiece is 1.80m, and the final image is at infinity. What is the angular magnification of the telescope? F=580×10² 14The distance between the lenses in a compound microscope is 18 cm. The focal length of the objective is 1.5 cm. If the microscope is to provide an angular magnification of - 68 when used by a person with a normal near point (25 cm from the eye), what must be the focal length of the eyepiece?Your telescope has a 850-mmmm-focal-length objective and a 22 mmmm -focal-length eyepiece. One evening you decide to look at the full moon in (Figure 1), which has an angular size of 0.52 ∘ when viewed with the naked eye. What angle (in degrees) does the image of the moon subtend when you look at it through your telescope? Suppose you decide to take a photograph of the moon using your telescope. You position a CCD detector so that it captures the image produced by the objective lens. What is the diameter of that image?
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- A farsighted person can read printing as close as 25.0 cm when she wears contacts that have a focal length of 38.0 cm. One day, however, she forgets her contacts and uses a magnifying glass, as in the drawing. It has a maximum angular magnification of 7.42 for a young person with a normal near point of 25.0 cm. What is the maximum angular magnification that the magnifying glass can provide for her? Virtual Magnifying glass Object LE ho dj. imageTo view the craters of the Moon, you construct a refracting telescope from a lens with a focal length of 91.9 cm as its objective and a 14.9 cm focal-length lens as its eyepiece. Determine the angular magnification ? of your telescope when you look at the Moon. ?= Is the image you see upright or inverted with respect to the object? inverted upright