Mark the following statements about lenses as true or false. ___ a. Incident par

Question

Mark the following statements about lenses as true or false.
___ a. Incident parallel light rays converge if thelens' focal length is negative. ___ b. If the path of converging light rays is tracedbackward, the rays appear to coe from a point from a point calledthe focal point. ___ c. A double convex lens has a negative focallength. ___ d. The focal length of a lens is alwayspositive.

___ a. Incident parallel light rays converge if thelens' focal length is negative. ___ b. If the path of converging light rays is tracedbackward, the rays appear to coe from a point from a point calledthe focal point. ___ c. A double convex lens has a negative focallength. ___ d. The focal length of a lens is alwayspositive.

Explanation / Answer

(a)

          True

(b)

         False

(c)

        False

(d)

       False   Since Focal length of convex lens is Positive and for a concave lens is negative.

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