The actual anode focal area for a 15-degree anode angle is 3.5 mm (length) by 1.5 mm (width). What is the projected focal spot size at the central axis?
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The actual anode focal area for a 15-degree anode angle is 3.5 mm (length) by 1.5 mm (width). What is the projected focal spot size at the central axis?
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- Let objective and eyepiece of a compound microscope have focal lengths of 2.5 cm and 10 cm, respectively and be separated by 12 cm. A 70- mobject is placed 6.0 cm from the objective. How large is the virtual image formed by the objective-eyepiece system?A lens with a focal length, f1 = +1.5 m is attached directly to a second lens with focal length, f2 = −2.5 m. What is the focal length of the combination?Your eye (diameter 2.5 cm) is able to focus the image of a tree on your retina. The tree is 18 m tall and 80 m away. What is the size of the image of the tree on your retina? (Be careful about the sign of the image size.)
- A glowing object 3.5 cm tall produced a virtual image 8.3 cm from the lens. If the focal length of the lens is 4.9 cm, what is the magnification of the object?Consider two thin lenses with focal lengths f1 = 10.0 cm and f2 = −15.0 cm. The lenses are placed in contact. Calculate the equivalent focal length of the lenses. What is the image distance of an object placed 20.0 cm from the lenses? Draw a diagram of the optical system and label the relevant quantitiesWhat is the height of an image in a diverging lens if: the object is 2cm tall, stands 20cm in front of the lens, and the focal length is 25cm?
- a telescope is 275mm long and has an objective lens with a focal length of 257mm. (a) what is the focal length of the eye piece? (b) what is the magnification of this telescope?For a camera equipped with a 55-mm-focal-length lens,what is the object distance if the image height equals theobject height? How far is the object from the image on thefilm?A movie camera with a (single) lens of focal length 75 mm takes a picture of a person standing 27 m away. If the person is 180 cm tall, what is the height of the image on the film?
- A diverging lens has a focal distance of f=0.2 cm. If an object is placed 0.1cm away, What is the image distance? Is the image real or virtual? What is the magnification?If the object is located in region 3 at 8 cm for a lens with a focal length of 10 cm, then what is the image distance? For a concave mirror What is the magnification for the image above?The focal points of a double concave lens are 10 cm from the optical center. A 8 cm tall object is located 15 cm from the optical center of the lens. How far from the optical center is the image located? What is the image height? Is the image Real or Virtual? What is the magnification of the lens? (round answers to 2 decimal places) a) = ____________ cm b) = _____________ cm c) The image is ______________ d) The magnification is _____________