Exploring Optical Telescopes in Astronomy

Which type of optical telescope uses lenses to gather and focus light?

• Reflecting telescope

• Refracting telescope

• Radio telescope

• Infrared telescope

What is the main component used to collect light in a reflecting telescope?

• Lens

• Prism

• Mirror

• Filter

Which part of an optical telescope is responsible for magnifying the image?

• Eyepiece

• Objective lens

• Mount

• Tube

What is the primary function of the objective lens or mirror in an optical telescope?

• To magnify the image

• To collect and focus light

• To adjust the telescope’s position

• To filter out unwanted wavelengths

Which astronomer is famous for building one of the first practical refracting telescopes?

• Isaac Newton

• Galileo Galilei

• Edwin Hubble

• William Herschel

Which type of telescope is most likely to suffer from chromatic aberration?

• Reflecting telescope

• Refracting telescope

• Radio telescope

• X-ray telescope

What is the main advantage of using a reflecting telescope over a refracting telescope?

• It is lighter in weight

• It does not suffer from chromatic aberration

• It is easier to transport

• It uses only lenses

If you want to observe faint galaxies, which component of the telescope should be as large as possible?

• Eyepiece

• Objective lens or mirror

• Focuser

• Mount

A student notices that the image in their refracting telescope has colored edges. Which optical issue are they observing?

• Spherical aberration

• Chromatic aberration

• Astigmatism

• Coma

Why are large refracting telescopes rarely built today?

• Lenses are too expensive to make

• Large lenses sag under their own weight and distort images

• Mirrors are not as effective as lenses

• They cannot magnify images