Answer:
1. Weight.
2. Large lens will tend to deflect under its own weight
Explanation:
Hello,
Weight is a big part of it. There’s a reason the largest working refractor on Earth (the Clark refractor at Yerkes Observatory in Wisconsin) has a 102-cm objective; a 125-cm lens was created for the Paris Exposition of 1900, but the accompanying telescope was a pain to use (very hard to aim) and was scrapped when no one wanted to buy it.
Lens can only be supported at its edges unlike mirrors, and a large lens will tend to deflect under its own weight unless it’s so thick that it won’t transmit much light. It is also extremely difficult to cast and polish a glass blank of such huge size, which is why (see List of largest optical refracting telescopes - Wikipedia) almost no one has tried building one in over a century.
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...
100 billion planets are in our galaxy.
About 60 billion planets are inhabitable by humans.
Hope this helps!
Atoms are the smallest particles of an element that can take part in achemical reaction. During anychemical reaction no particles are created or destroyed: the atoms are simply rearranged from the reactants to the products. ... Mass is never lost or gained in chemical reactions. We say that mass is always conserved.
No, phosphorus is not a metal, In fact, it is a non metal which means that it isn't metal. If you look at the periodic table, the word phosphorus, is in group 15.
Br
This is because if u follow the periodic table u will do energy level 1 the 2 and so on and so forth until u reach the element.
