Can you please explain what is F1 and F2 and C1 and C2 in the lenses. I am not able to understand this concept. Please also explain where the image forms when  the object is placed at different positions in a concave and convex lens with the help of a diagram. Mainly, Give me the diagrams. It will Be very useful

Dear student,
Kindly post you queries in different threads to get the answers of all the queries.

2. Ray diagrams of image formation by convex lens for various positions of the object is given below :
a. At infinity.
b. Beyond 2 F1
c. At 2 F1
d. Between F1 and 2 F1
e. At focus F1
f. Between focus F1 and optical centre O of the lens.


Ray diagrams of image formation by concave lens for various positions of the object is given below :
a. At infinity.
b. Between infinity and optical centre O of the lens.



Hope this information will clear your doubts about the topic.
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