Lab #4: Telescope Optics (continued)LAW OFREFRACTIONANGLE OFINCIDENCE0⁰10⁰20⁰30°40°50⁰60°70⁰80°ANGLE OF REFRACTION (0)80⁰70⁰60°50⁰40⁰30⁰20⁰10⁰0⁰0⁰ANGLE OFREFRACTION/Use unfilledcircles to plotthese points.Page 3 of 6LAW OFREFLECTIONANGLE OFINCIDENCE0⁰10⁰20⁰30⁰40°50⁰60⁰70⁰80⁰ANGLE OFREFLECTION80⁰-70°60°50°40°30°-20°-10°·0⁰10⁰ 20⁰ 30⁰ 40⁰ 50⁰ 60⁰ 70⁰ 80⁰ANGLE OF INCIDENCEUse filledcircles to plthese poinANGLE OF REFLECTION () Lab #4: Telescope Optics (continued)Page 5 of 6Make a refracting telescope using the lenses in the white envelopes on the lab table as follows:• Carefully insert the thin lens in one of the lens holders.Alternatively, you may hold it securely between your fingersas shown in the figure at right. Insert the thick lens intoa lens holder or hold it securely.THICKLENS• Align the lenses so that you can look through both in the direction of the paper on the walllabeled "NORTH". While keeping the thick lens close to your eye, move the thin lens slowlytoward or away from the thick lens. At some point, the word "NORTH" should come into focus.1) Is the image you see upside down & reversed?,2) Is the size of the image larger than what you see with the naked eye?3) Do you notice anything peculiar around the edges of the letters and paper?Complete the chart on the next page. Your instructor will distribute concave mirrorsand binoculars. A Newtonian reflecting telescope is located in the northwest cornerof the lab room.• To measure the diameter, place the lens or concave mirror on the ruler at right.Use a meter stick to measure the diameter of the Newtonian telescope's tube.• To compute the radius, divide the diameter by two.• To find the area, square the radius and multiply it by J (~3.14).• To find the Light Gathering Power (LGP) as eye area equivalents, divide the areaof the lens or mirror by the area of the lens of the human eye.• To find the Resolving Power (RP), use the following relationship:Resolving power of lens or mirror in degrees =Diameter of eye's lens in cm x 0.02⁰Diameter of lens or mirror in cm• To measure the focal lengths of the lenses, mount them in the optical bench asshown in the diagram below and adjust the screen until a focused image appears onthe screen. The distance between the screen and lens is the focal length. Note: Keepthe light source as far from the lens as possible. You can also use light from a sourceoutside such as reflected light from a distant building or from a streetlight. For theconcave mirror, reflect the light back to its source and find the point where the lightis brought to a focus. Use a meter stick to measure the length of the Newtoniantelescope's tube.screenlens inholderlightsourceTHINLENSoptical benchTo find the Magnifying Power (MP), divide the focal length of the objective lens ormirror by the focal length of the eyepiece.centimetersONلا0010

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ab #4: Telescope Optics (continued) Page 5 of 6 ke a refracting telescope using the lenses in the white envelopes on the lab table as follows: arefully insert the thin lens in one of the lens holders. ternatively, you may hold it securely between your fingers shown in the figure at right. Insert the thick lens into ens holder or hold it securely. lign the lenses so that you can look through both in the direction of the paper on the wall eled "NORTH". While keeping the thick lens close to your eye, move the thin lens slowly vard or away from the thick lens. At some point, the word "NORTH" should come into focus. is the image you see upside down & reversed? Is the size of the image larger than what you see with the naked eye? Do you notice anything peculiar around the edges of the letters and paper? mplete the chart on the next page. Your instructor will distribute concave mirrors binoculars. A Newtonian reflecting telescope is located in the northwest corner the lab room. THICK LENS To measure the diameter, place the lens or concave mirror on the ruler at right. Use a meter stick to measure the diameter of the Newtonian telescope's tube. To compute the radius, divide the diameter by two. To find the area, square the radius and multiply it by ♬ (~3.14). To find the Light Gathering Power (LGP) as eye area equivalents, divide the area. of the lens or mirror by the area of the lens of the human eye. To find the Resolving Power (RP), use the following relationship: Resolving power of lens or mirror in degrees Diameter of eye's lens in cm x 0.02⁰ Diameter of lens or mirror in cm o measure the focal lengths of the lenses, mount them in the optical bench as own in the diagram below and adjust the screen until a focused image appears on screen. The distance between the screen and lens is the focal length. Note: Keep light source as far from the lens as possible. You can also use light from a source side such as reflected light from a distant building or from a streetlight. For the cave mirror, reflect the light back to its source and find the point where the light brought to a focus. Use a meter stick to measure the length of the Newtonian escope's tube. screen lens in holder optical bench light source THIN LENS o find the Magnifying Power (MP), divide the focal length of the objective lens or rror by the focal length of the eyepiece. O 6