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

    0
    ReputationRep:
    I've recently conducted an experiment using 4 different width convex lenses (15mm, 13mm, 8mm and 6mm) and I noticed that the two thickest lenses had focal lengths that were very similar (around 0.2cm difference between the average focal length of the 15mm and 13mm lenses).

    However, the two other lenses, had focal lengths that were very far apart; on average around 170cm between the average focal lengths of the 8mm and 6mm lenses.

    Does anyone know why this is? I know it's do do with the curvature of the lens, but the two thickest and two thinnest lenses have the same width difference- 2mm- so I thought the distance between each pair would have been similar.
    Offline

    9
    (Original post by wegeton)
    I've recently conducted an experiment using 4 different width convex lenses (15mm, 13mm, 8mm and 6mm) and I noticed that the two thickest lenses had focal lengths that were very similar (around 0.2cm difference between the average focal length of the 15mm and 13mm lenses).

    However, the two other lenses, had focal lengths that were very far apart; on average around 170cm between the average focal lengths of the 8mm and 6mm lenses.

    Does anyone know why this is? I know it's do do with the curvature of the lens, but the two thickest and two thinnest lenses have the same width difference- 2mm- so I thought the distance between each pair would have been similar.
    The "Lensmaker's Formula" is what you want.

    http://en.wikipedia.org/wiki/Lens_(o...r.27s_equation
 
 
 
  • 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
    Would you like to hibernate through the winter months?
  • 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.