Users' questions

What are 3 disadvantages of refractor telescopes?

What are 3 disadvantages of refractor telescopes?


  • Very high initial cost relative to reflector.
  • A certain amount of secondary spectrum (chromatic aberration) unavoidable (reflector completely free of this) The colours cannot focus at one point.
  • Long focal ratios can mean that the instrument is cumbersome.

What is a disadvantage of a refractor telescope?

Another disadvantage is that the refracting telescope don’t focus the colours very well because the light just bounces of and creates different colours that are just bending and refracting everywhere,focusing different colours at different points.

What are the disadvantages of electronic commerce?

Disadvantages of eCommerce

  • Customers have concerns about privacy and security. Some consumers are still wary about giving out personal information, especially credit and debit cards, to online sources.
  • Lack of in-store engagement with customers.
  • The added cost of operating an online store.

What are the common problems or disadvantages of e commerce?

16 Disadvantages Of E-commerce – Problems with E-commerce

  • Security.
  • Site crash.
  • No possibility of tried and tested product.
  • Late delivery.
  • Some products are difficult to buy online.
  • Lack of privacy.
  • Tax issues.
  • Legal issues.

What are 2 problems with refracting telescopes?

The two problems with refracting telescopes are a chromatic aberration and spherical aberration.

What is the world largest refracting telescope?

Yerkes Observatory
Yerkes Observatory, in Williams Bay, Wisconsin, houses the largest refracting telescope ever built for astronomical research, with a main lens that’s 40 inches (1.02 meters) in diameter.

Why is eCommerce bad?

Security and credit card fraud are also huge risks when dealing with online shopping. Consumers run the risk of identity fraud and similar hazards every time they enter their details into a site. If your site doesn’t convince shoppers that the check-out process is secure, they could get scared out of buying.

What is the advantage and disadvantage of e-commerce?

Electronic commerce will substantially lower the transaction cost. It eliminates many fixed costs of maintaining brick and mortar shops. This allows the companies to enjoy a much higher margin of profit. It provides quick delivery of goods with very little effort on part of the customer.

What is the limit of e-commerce?

Findings – There are found to be six main limitations of e-commerce: security and trust; internet experience; enjoyment; language; legal issues; and technology acceptance (ease of use and usefulness).

Why is ecommerce bad?

What problem that a refracting telescope might have does a reflecting telescope overcome?

chromatic aberration
Reflecting telescopes solve the problem of chromatic aberration, which often occurs with refracting telescopes.

What are the advantages and disadvantages of refracting telescopes?

They can be heavy especially larger aperture telescopes because of their need for large lenses, They can also have a longer body which may impact on transportation and storage, and there is a certain amount of secondary spectrum (chromatic aberration) unavoidable (the reflector completely free of this).

What is the purpose of a reflector telescope?

The use of reflector telescopes is to see distant objects by magnifying them. The absorption or reflection of electromagnetic radiation from the object is what enables it to be magnified. The reflector telescope is the first physical telescope made by using glass lenses. This telescope uses glass lenses and mirror to gather and focus light.

How does a refracting telescope bend the light?

Refracting telescopes use lenses to bend the light to a specific focal point such that the object will be magnified to the viewer, It is the simplest type of telescope and the most recognizable, Its design is very simple, It is essentially a tube with a lens at each end.

Why do refractors use multiple compensating lenses?

All refractors telescopes suffer from an effect called the chromatic aberration that produces a rainbow of colors around the image, One way to reduce this problem is to use the multiple compensating lenses to counteract the effects of this kind of aberration.