9.1 Telescopes

• There are two main types of telescopes: refracting and reflecting
• What light-collecting element do reflecting telescopes use?

  Mirrors
• Match the telescope type with its advantage:

  Refracting telescope ↔️ High-quality images

  Reflecting telescope ↔️ No chromatic aberration
• Refracting telescopes use lenses
• What is a key advantage of reflecting telescopes over refracting telescopes?

  No chromatic aberration
• Match the telescope type with its light collecting element:

  Refracting Telescopes ↔️ Lenses

  Reflecting Telescopes ↔️ Mirrors
• The primary advantage of reflecting telescopes is their ability to collect more light due to larger mirrors.


  True
• Reflecting telescopes use mirrors instead of lenses to collect and focus light.


  True
• Reflecting telescopes may produce distorted images due to optical aberrations
• What is a disadvantage of reflecting telescopes related to image quality?

  Distorted images
• Reflecting telescopes may produce distorted images due to the curvature of their mirrors.


  True
• Reflecting telescopes do not suffer from chromatic aberration
• The light-collecting element in a refracting telescope is a lens
• Reflecting telescopes can produce distorted images
• Higher magnification always results in higher resolution.

  False
• What type of light-collecting element do refracting telescopes use?

  Lenses
• What is a key disadvantage of refracting telescopes?

  Chromatic aberration
• What is the main limitation of refracting telescopes in terms of size?

  Lens sagging
• Chromatic aberration is a disadvantage of reflecting telescopes.

  False
• Reflecting telescopes can be made larger than refracting telescopes because mirrors do not sag like lenses.

  True
• Reflecting telescopes do not suffer from chromatic aberration because mirrors reflect all wavelengths of light equally.


  True
• The diameter of the objective lens or mirror determines the resolution of a telescope.


  True
• What type of telescope uses lenses to collect and focus light?

  Refracting
• What is the purpose of eyepieces in telescopes?

  Magnify and focus image
• What type of lens is used in a refracting telescope to gather light?

  Objective lens
• Steps in the formation and capture of astronomical images

  1️⃣ Light is gathered and focused by lenses or mirrors

  2️⃣ An astronomical image forms at the focal plane

  3️⃣ The image is captured by photographic plates or digital sensors

  4️⃣ Focusing, filtering, and calibration processes are applied
• Optical filters are used in telescopes to isolate specific wavelengths
• What are two types of cameras used with telescopes?

  Digital and specialized
• Reflecting telescopes do not suffer from chromatic aberration.


  True
• The primary purpose of a telescope is to gather more light
• Refracting telescopes produce high-quality images
• Reflecting telescopes do not suffer from chromatic aberration
• What is a disadvantage of refracting telescopes due to lens sagging?

  Limited size
• What is the primary purpose of a telescope?

  To gather more light
• Refracting telescopes suffer from chromatic aberration.


  True
• Refracting telescopes use lenses as their light-collecting element
• What are the two main types of telescopes?

  Refracting and reflecting
• What is a disadvantage of refracting telescopes related to their lenses?

  Lens sagging
• Reflecting telescopes use mirrors to collect and focus light.


  True
• Reflecting telescopes can be made larger than refracting telescopes due to mirror support.


  True