Universe: Stars And Galaxies
6th Edition
ISBN: 9781319115098
Author: Roger Freedman, Robert Geller, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 6, Problem 3Q
To determine
The reason for the light rays to be essentially parallel which enter the telescope.
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Design an eye for a(n) using a concave spherical mirror such that the image of an object 1.0 m tall and 10 m away fully fills its 1.0-cm square photosensitive detector (which is movable for focusing purposes). Where should this detector be located with respect to the mirror? What should be the focal length of the mirror? Draw a ray diagram.
Chapter 6 Solutions
Universe: Stars And Galaxies
Ch. 6 - Prob. 1QCh. 6 - Prob. 2QCh. 6 - Prob. 3QCh. 6 - Prob. 4QCh. 6 - Prob. 5QCh. 6 - Prob. 6QCh. 6 - Prob. 7QCh. 6 - Prob. 8QCh. 6 - Prob. 9QCh. 6 - Prob. 10Q
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- People are often bothered when they discover that reflecting telescopes have a second mirror in the middle to bring the light out to an accessible focus where big instruments can be mounted. “Don’t you lose light?” people ask. Well, yes, you do, but there is no better alternative. You can estimate how much light is lost by such an arrangement. The primary mirror (the one at the bottom in Figure 6.6) of the Gemini North telescope is 8 m in diameter. The secondary mirror at the top is about 1 m in diameter. Use the formula for the area of a circle to estimate what fraction of the light is blocked by the secondary mirror. Figure 6.6 Focus Arrangements for Reflecting Telescopes. Reflecting telescopes have different options for where the light is brought to a focus. With prime focus, light is detected where it comes to a focus after reflecting from the primary mirror. With Newtonian focus, light is reflected by a small secondary mirror off to one side, where it can be detected (see also Figure 6.5). Most large professional telescopes have a Cassegrain focus in which light is reflected by the secondary mirror down through a hole in the primary mirror to an observing station below the telescope.arrow_forwardWhat happens to a light wave when it travels from air into glass? (a) Its speed remains the same. (b) Its speed increases. (c) Its wavelength increases. (d) Its wavelength remains the same. (e) Its frequency remains the same.arrow_forwardIn a reflecting telescope the objective is a concave mirror of radius of curvature 2m and an eyepiece is a convex lens of focal length 5 cm. Find the apparent size of a 25-m tree at a distance of 10 km that you would perceive when looking through the telescope.arrow_forward
- QUESTION 4 The primary mirror of the orbiting telescope has a diameter of 6.7 cm. being in orbit, this telescope avoids the degrading effects of atmospheric distortion on its resolution. Assuming an average light wavelength of 550 nm, what is the angle between two just-resolvable point light sources? OA 12.33 x 10-6 cm OB 10.01 x 10-6 cm OC8.02 x 10-6 cm OD 14.41 x 10-6 cm QUESTION S Two rectangular pieces of plane glass sit on top another on a flat table as in Figure 1 below. A thin strip HOW ENarrow_forwardThe primary mirror on a telescope is able to resolve objects that are theta o apart. If you replace the mirror with one that has it in diameter six times smaller than the first what will be the angular resolution of the telescopearrow_forward2. Please refer to part (b) of Figure 1 included with this quiz. Here, theta (the angle the incident ray makes with respect to the vertical) is 65.8 degrees. What is d (the distance between the ray emerging from the bottom of the glass and where the ray would have been if it had continued straight on with no glass to refract it)? 5.92 m 3.48 m 2.44 m 4.87 marrow_forward
- The figure shows a body of liquid where 2 meter tall pillar extends vertically from the bottom to a point .5 m above the surface of the liquid. If the suns rats are incident at angle 55 degrees, what is the total length of the darkness at the bottom caused by the pillar?arrow_forwardQ. No 06: Show that Î;(cos² – sin² o + 2i sin ø cos ø) = 2h²iº, where o is the azimuthal angle.arrow_forwardA Newtonian telescope has a mirror diameter of 300 mm and a focal length of 1500mm. The tube has an external diameter of 330mm and the focal plane is 40mm outside the tube.arrow_forward
- Common Properties of Light Light strikes a plane mirror as shown. If the incident ray makes an angle of 30° with the normal as shown below, what is the 0? Normal e = 30° A 45° B 60° C 90° 120° 1 8 MacBook Air DII DD F9 9, 4- 2.arrow_forwardA laser beam with a total power of 22 watts is incident at a normal angle of incidence on a Lambertian surface. How much power reaches a detector with an area of 0.1 cm2 at an angle of 25 degrees located at a distance of 40 cm from where the beam strikes the surface? Please check closest answer. 0.525 mW 0.397 mW 0.247 mW 0.421 mWarrow_forwardThe headlights of an automobile are set such that the beam drops 1 in for each 28 ft in front of the car. What is the angle (give positive value) between the beam and the road in degrees ?arrow_forward
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