What is meant by the optical centre of a convex lens?

What is meant by 1 F ?

What is meant by rust?

What is meant by groups?

What is meant by Catenation?

What is meant by the molality of a solutin?

What is meant by an error?

What is meant by Peptide linkage

What is meant by biocatalysts ?

An object is placed in between the optical centre and focus of a thin convex lens. What is the nature of image of the object?