A $35 - \mathrm { mm }$ Single Lens Reflex (SLR) Digital Camera Is Using a Lens

Short Answer

A $35 - \mathrm { mm }$ single lens reflex (SLR) digital camera is using a lens of focal length $35.0 \mathrm {~mm}$ to photograph a person who is $1.80 \mathrm {~m}$ tall and located $3.60 \mathrm {~m}$ from the lens.
(a) How far is the CCD sensor from the lens when the person is in focus?
(b) How tall is the person's image on the CCD sensor?