Optics, the resulting power of the lens .?

[mero coactail]

optics, the resulting power of the lens...??

a thin lens , made of refractive index 1.5,has a front surface +11 d power and back surface -6d ..if this lens is submerged in a liquid of refractive index 1.6, the resulting power of the lens is...

a)-1 dioptre

b)+1 dioptre

c)-5 dioptre

d)+5 dioptre

pleasezzz answer ,,,and why please ..its emergency..

 

[tiny-tim]

hi mero coactail! welcome to pf!

a thin lens , made of refractive index 1.5,has a front surface +11 d power and back surface -6d ..if this lens is submerged in a liquid of refractive index 1.6, the resulting power of the lens is...

a)-1 dioptre

b)+1 dioptre

c)-5 dioptre

d)+5 dioptre

pleasezzz answer ,,,and why please ..its emergency..

what equations are relevant here?

show us what you've tried, and where you're stuck, and then we'll know how to help!