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CBSE Notes 2011-2012

Which of the following statements is/are true ?

Multiple choice question

Which of the following statements is/are true ?

unknown

A convex lens has 4 dioptre power having a focal
length 0.25 m

unknown

A convex lens has - 4 dioptre power having a focal
length 0.25 m

unknown

concave lens has 4 dioptre power having a focal
length 0.25 m

unknown

A concave lens has - 4 dioptre having a focal 0.25 m