A thin convex lens and a thin concave lens are kept in  contact and are co-axial. Which of the following statements is correct for this combination of two lenses ?

A

behaves as  concave lens if $$|f_{\text{convex}}| > |f_{\text{concave}}|$$

B

behaves  as concave if $$|f_{\text{convex}}| < |f_{\text{concave}}|$$

C

behaves  as convex if $$|f_{\text{convex}}| > |f_{\text{concave}}|$$

D

The focal length of the lens system will changes if the positions of two lenses are interchanged