Which of the following statement is true? [NCERT Exemplar]
A. A convex lens has 4D power having a focal length 0.25 m
B. A convex lens has 4D power having a focal length -0.25 m
C. A concave lens has 4D power having a focal length 0.25 m
D. A concave lens has 4D power having a focal length -0.25 m
Answer:A
Which of the following statement is true? [NCERT Exemplar]
A. A convex lens has 4D power having a focal length 0.25 m B. A convex lens has 4D power having a focal length -0.25 m C. A concave lens has 4D power having a focal length 0.25 m D. A concave lens has 4D power having a focal length -0.25 m