A new generation of telescopes is currently being built that overcomes the limitations of the older large telescopes. Some of these new telescopes   a. use segmented mirrors.   b. use mirrors that are very thin.   c. use active optics to control the shape of the mirror.   d. do all of the above.   e. do none of the above.

pility: Good to go The sun is 150,000,000 km from earth; its diameter is 1,400,000 km. For a science project on solar power, a student uses a 24-cm-diameter converging mirror with a focal length of 53 cm to focus sunlight onto an object. This casts an image of the sun on the object. For the most intense heat, the image of the sun should be in focus. a. Where should the object be placed? b. What is the diameter of the image? 2 c. The intensity of the incoming sunlight is 1050 W/m². What is the total power of the light captured by the mirror? d. What is the intensity of sunlight in the projected image? Assume that all of the light captured by the mirror is focused into the image. Focus 88 E 84°F ^

This questions have of multiple true & false. Choose a CORRECT set of answer for each question.

In a refracting telescope, spherical aberration limits __________ .   a. The length of the telescope   b. The focal length of the eyepiece   c. Chromatic aberration   d. The diameter of the objective lens   e. The total focusing power of the telescope