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(a) A convex lens has 4 dioptre power having a focal length 0.25 m(b) A convex lens has –4 dioptre power having a focal length 0.25 m(c) A concave lens has 4 dioptre power having a focal length 0.25 m(d) A concave lens has –4 dioptre power having a focal length 0.25 m |
| Answer» (a) A convex lens has 4 dioptre power having a focal length 0.25 m | |