You have a telescope that consists of two converging lenses which are placed a distance apart which is approximately equal to the sum of their focal lengths. Focal length 1 is appriximatly 5.5cm and focal length 2 is approximatly 25cm.  The lens closest to the onject should have a resonably long focal length and the eyepiece lens should have a relatively short focal length to get good magnification.   a. draw a scale ray diagram for a telescope using one long and one short focal length lens. b. Estimate how much larger your distance object appears through your telescope and then calculate the angular magnification.

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Lenses with given radii. Object O stands in front of a thin lens, on the central axis. For this situation, each problem in the table (below) gives object distance p, index of refraction n of the lens, radius r, of the nearer lens surface, and radius r, of the farther lens surface. (All distances are in centimeters.) Find (a) the image distance i and (b) the lateral magnification m of the object, including signs. Also, determine whether the image is (c) real or virtual, (d) inverted from object O or noninverted, and (e) on the same side of the lens as object O or on the opposite side. (a) (b) (c) (d) (e) in r2 i m R/V I/NI Side +14 1.52 -42 +42 (a) Number Units cm (b) Number Units This answer has no units v (c) virtual v (d) noninverted ♥ (e) same

These images show one of the large `VLT’ telescopes at the European Southern Observatory’s facility at Cerro Paranal, Chile. The place where the laser beam comes out (seen in the inset photo) is just out of sight off of the top edge of the large photo. Also note that if you look down the telescope tube (in the main photo), you can see the tube’s front-end structure. Why is there a laser beam shooting out of the front of this telescope (in the inset picture)? Group of answer choices The beam creates an `artificial star’, which is used by an adaptive-optics system to measure (and counteract) the blurring effect of Earth’s atmosphere. The astronomers are bouncing light off of objects near the center of the Milky Way galaxy, to measure their distances from Earth. The astronomers are taking pictures of the surface of a planet (most likely Mars), and the laser allows them to light up the planet’s surface with a very specific color of light. The astronomers are engaged in the opening…

The isometric view of an object is presented in Figure 1.2 below. Draw by hand three planes of 'orthographic' projection (i.e., top, front, and side views). The dimensions of your drawing are not important. Figure 1.2

A woman wears bifocal glasses with the lenses 2.0 cm in front of her eyes. The upper half of each lens has power -0.500 diopter and corrects her far vision so that she can focus clearly on distant objects when looking through that half. The lower half of each lens has power +2.00 diopters and corrects her near vision when she looks through that half. (a) What are the far point and near point of her eyes? (b) While the woman is repairing a leaky pipe under her kitchen sink, she looks at close objects through the upper half of her bifocal lenses. What is the closest object that she can see clearly?

INDICATE THE CORRECT MISSING VIEW THAT WILL COMPLETE AN ACCURATE ORTHOGRAPHIC REPRESENTATION OF THE OBJECT

Simple one

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Q. 2. A Figure 2 shows an isometric view of an object. Draw to a full size scale the following views in first angle projection. (a) Sectional front view, (b) Top view and (c) Sectional side view 40 SQ. Through holes 60 60- 60 180 B. 0. 30 1515