13. Which of the following is not true for a biconvex lens ? A) The focal length of biconvex lens is always positive B) The focal length of biconvex lens depends on material of the lens used and the medium in which it is kept C) Biconvex lens can form both virtual and real images for real objects. D) It is used to correct Hypermetropia.
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Reticulate venation refers to the arrangement of veins in a leaf where they form a web-like structure. Smaller and more delicate veins emerge from the midrib and spread in the entire leaf. For example, mango and rose leaves; their veins form a network.
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