An electronic device includes: a first sensor mounted inside a body of the electronic device; a second sensor configured to sense a posture of the body; an optical device configured to: reflect light output from the first sensor by using a mirror, and output the reflected light to an outside of the electronic device through a transparent region in the electronic device; a processor configured to: obtain information on the posture of the body through the second sensor, obtain information on a tilting angle of the mirror based on the obtained posture of the body and a refractive index of the transparent region, and control the mirror based on the obtained information on the tilting angle.