You observe two objects with the same telescope. The telescope is only able to gather visible light. The light you observe from object A has a longer wavelength than the light you observe from object B. Based on this information, which of the following statments MUST be true Light is being reflected from object A Light observed from object B is bluer Light observed from object A is redder Light is being reflected from object B

Astronauts observing from a space station need a telescope with a resolving power of 0.6 arc second at a wavelength of 530 nm and a magnifying power of 220. Design a telescope to meet their needs.What will its light-gathering power be, compared with a dark-adapted human eye? (Assume that the pupil of your eye can open to a diameter of about 0.8 cm in dark conditions.)(State the necessary primary diameter of the telescope, in m, and the ratio of the focal lengths below.)

You can see your lecturer in class (if you are there) because They emit visible light They reflect visible light O They emit infrared radiation O They reflect infrared radiation

Instead of a dot, sometimes the telescope image of a star looks like concentric rings.  This is due to: a)diffraction. b)reflection. c)refraction. d)scatter.

The image shows the spectra of two objects, labeled 1 and 2. Which of the following statements is a correct interpretation of these spectra? Intensity 1 2 Wavelength O object 1 is younger than object 2 object 1 is brighter than object 2 at all wavelengths object 2 is farther from us than object 1 object 1 emits less red light than object 2 object 2 emits more blue light than object 1

What is the limit of angular resolution for a 6.3-m telescope at a wavelength of 533nm?