Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    0
    ReputationRep:
    Hello,
    Please could I have some help with refraction and telescopes and lenses please- all part of P1.
    Thanks a lot
    • Community Assistant
    Offline

    21
    ReputationRep:
    Community Assistant
    I can explain the principle, if you want. Here is a picture to understand.

    The objective has a collecting lens, where the parallel light rays are refracting, so they hit each other in a common point, the focus (focal point). The distance between the collecting lense and the focus is the focal length. The same goes for the eyepiece lense too (it is a collecting lense as well). So both lenses have a common focal point, where the image can be observed. As the refracting telescope has a long focal length, it is able to get images which have a long distance to this telescope (so called tele-focal point).*
    • Thread Starter
    Offline

    0
    ReputationRep:
    (Original post by Kallisto)
    I can explain the principle, if you want. Here is a [url=http://www.pas.rochester.edu/~blackman/ast104/refracting.gif]picture] to understand.

    The objective has a collecting lens, where the parallel light rays are refracting, so they hit each other in a common point, the focus (focal point). The distance between the collecting lense and the focus is the focal length. The same goes for the eyepiece lense too (it is a collecting lense as well). So both lenses have a common focal point, where the image can be observed. As the refracting telescope has a *long focal length, it is able to get images which have a long distance to this telescope (so called tele-focal point).*
    Thank you, this helps a lot, although the link doesn't seem to be working.
    • Community Assistant
    Offline

    21
    ReputationRep:
    Community Assistant
    (Original post by esha20x)
    Thank you, this helps a lot, although the link doesn't seem to be working.
    It works. Have just made mistakes to embed the link. The problem is solved, the link has to be worked now.*
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Have you ever participated in a Secret Santa?
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

    Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

    Quick reply
    Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.