This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: Why are most large telescopes reflectors, not refractors? A) Large lenses deform under their own ... (Read 47 times)

future617RT

  • Hero Member
  • *****
  • Posts: 543
on: Jul 27, 2018
Why are most large telescopes reflectors, not refractors?
 
  A) Large lenses deform under their own weight, but mirrors can be supported.
  B) Large mirrors need only one optical surface, achromats four surfaces to grind.
  C) Reflectors do not suffer from chromatic aberration like refractors do.
  D) Large, very clear lenses are harder to cast than more tolerant mirror blanks.
  E) All of the above are correct.

Question 2

How can we determine the reflectivity of an asteroid?
 
  A) by taking a photograph of it
  B) by measuring its mass and radius
  C) by comparing its brightness in visible light to its brightness in infrared light
  D) by where it is located in the asteroid belt


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

sarahccccc

  • Sr. Member
  • ****
  • Posts: 318
Reply #1 on: Jul 27, 2018
Answer to Question 1

E

Answer to Question 2

C


future617RT

  • Member
  • Posts: 543
Reply 2 on: Jul 27, 2018
YES! Correct, THANKS for helping me on my review

upturnedfurball

  • Member
  • Posts: 334
Reply 3 on: Yesterday
:D TYSM

« previous next »
 

Did you know?

Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.

Did you know?

Fatal fungal infections may be able to resist newer antifungal drugs. Globally, fungal infections are often fatal due to the lack of access to multiple antifungals, which may be required to be utilized in combination. Single antifungals may not be enough to stop a fungal infection from causing the death of a patient.

Did you know?

There are 20 feet of blood vessels in each square inch of human skin.

Did you know?

Though “Krazy Glue” or “Super Glue” has the ability to seal small wounds, it is not recommended for this purpose since it contains many substances that should not enter the body through the skin, and may be harmful.

Did you know?

A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.

(a) Feeding by bear on salmon results in large allochthonous inputs of nutrients into (b) the forest (a) Feeding by bear on salmon results in large allochthonous inputs of nutrients into (b) the forest
Large-scale impacts of the (a) positive, and (b) negative phases of the North Atlantic Oscillation. Large-scale impacts of the (a) positive, and (b) negative phases of the North Atlantic Oscillation.
Portrait of a Shy Albatross. Note the large, hooked beak and nasal tubes. Portrait of a Shy Albatross. Note the large, hooked beak and nasal tubes.
Illustration of a large aneurysm in the abdominal aorta that has ruptured. Illustration of a large aneurysm in the abdominal aorta that has ruptured.
Large white butterfly egg Large white butterfly egg
The Globe Fishery packs shrimp that weigh more than 1.91 ounces each in packages marked large ... The Globe Fishery packs shrimp that weigh more than 1.91 ounces each in packages marked large ...
Video: Major Elements in Biological Molecules: Nucleic acids

For a complete list of videos, visit our video library