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1. Answer the questions:

  1. Why is additional source of illumination used in some cases?

  2. What are the characteristic features of professional telescope?

  3. Why do smaller focal-length eyepieces cause greater magnification?

  4. What are the most famous compound optical instruments is science?

  5. What does periscope consist of?

  6. With what lenses were microscope first developed?

2. Fill in the gaps:

    1. The objective lens of the telescope was designed with … to avoid optical aberrations

    2. The larger the primary mirror, … .

    3. Modern microscopes … to optimize the functionality and enhance image stability.

    4. The comparison microscope looks … to produce a stereoscopic binocular view.

    5. Since crafting large lenses is much more difficult then crafting large mirrors, most modern telescopes are … , that is, telescopes that use … rather than … .

3. Say what is false and what is true:

  1. A periscope is two mirrors aligned to allow for viewing around obstructions.

  2. Microscopes were first developed with four lenses.

  3. Modern microscopes have few lenses in them to optimize the functionality and enhance image stability.

  4. Because the magnification of a telescope is more than the focal length of the objective divided by the focal length of the eyepiece, smaller focal-length eyepiece causes greater magnification.

4. Match the halves of the sentences:

    1. The main goal of a telescope is …

    2. The absolute value for the exposure time required depends on …

    3. Modern compound microscopes have many lenses in them …

    4. A periscope …

    5. Microscopes were first developed with two lenses …

    6. The most famous compound optical instruments are …

    7. The build of view changes …

    8. This is any lens with a local length …

      1. to optimize the functionality and enhance image stability.

      2. is simply two plane mirrors.

      3. the microscope and the telescope collection of light an objective lens and an eyepiece.

      4. larger than the diagonal measure of the film or sensor.

      5. how sensitive to light the medium is.

      6. with the local length of the lens.

Some extra texts to enjoy and ponder on Text 1. In Space and On Earth, Why Build It, When a Robot Can Build It for You?

Like something straight out of "Star Wars," armies of robots could nimbly be crawling up towers and skyscrapers to make repairs in the not-so-distant future, so humans don't have to.

That's just one thing researchers in Hod Lipson's Creative Machines Lab envision with their latest robot prototype. It can autonomously traverse and manipulate a 3-D truss structure, using specially designed gears and joints to assemble and disassemble the structure as it climbs. Lipson is an associate professor of mechanical and aerospace engineering, and of computing and information science at Cornell University.

The robot's design is detailed in a paper accepted by IEEE Robotics and Automation, to appear soon online and in print. Its co-authors include former visiting scientist Franz Nigl, former visiting Ph.D. student Shuguang Li, and undergraduate Jeremy Blum.

"What gets me most excited is this idea of safety," said Blum, a student researcher working on the project. Having a robot able to climb and reconfigure building structures, even just to deliver materials, would be a step toward making construction zones safer for humans, he said.

The researchers also point to space-exploration applications. Instead of sending astronauts out on a dangerous spacewalk at the International Space Station, a robot could be deployed to repair a damaged truss.

The robot is equipped with an onboard power system, as well as reflectivity sensors so it can identify where it is on the structure. This allows it to maneuver accurately without explicit commands, Blum added.

Lipson said he envisions transforming the built environment with the help of these kinds of technologies. Instead of making buildings out of concrete or other non-recyclable materials, components designed specifically for robots could be used to build or reconfigure structures more efficiently -- for example, after an earthquake, or if an outdated building needed to be torn down in favor of something better.

"Right now, we are very bad at recycling construction materials," Lipson said. "We are exploring a smarter way to allow the assembly, disassembly and reconfiguration of structures."

The project is part of a National Science Foundation Emerging Frontiers in Research and Innovation grant jointly awarded to Lipson at Cornell, Daniela Rus of the Massachusetts Institute of Technology, Mark Yim of the University of Pennsylvania, and Eric Klavins of the University of Washington.