The refractive index of a lens material is 1.5 and focal length f. Due to some chemical changes in the material, its refractive index has increased by 2%. The percentage change in its focal length is

The refractive index of a lens material is 1.5 and focal length f. Due

1.	The refractive index of a lens material is 1.5 and focal length f. Due to some chemical changes in the material, its refractive index has increased by 2%. The percentage change in its focal length is
Answer» `+4.5%` `-4.5%` `+5.67%` `-5.67%` ANSWER :D