a) Find the focal length of this lens?

b) Find optical power of the lens?

Using lensmaker’s equation Following the sign convention for spherical refracting surfaces, we have Convex: R _{1} = + 8 cmConcave: R _{2} = - 8 cmUsing these values for radii and n = 1.5 for the index of refraction, we can find focal length for this lens f = 8 cm Focal length of the lens is 8 cm.
The optical power P of a lens is defined as the inverse of its focal length. P = 12.5 d Optical power of the lens is 12.5 d. |