Index.of Man In Pain What Is The Length Of The Smallest Mirror In Which A Man 180cm Tall Can See Himself At Full Length?

What is the length of the smallest mirror in which a man 180cm tall can see himself at full length? - index.of man in pain

1) A beam of light traveling parallel to the optical axis in the air (n = 1) incident on a spherical surface to a height of 0.02 million. If the material is on the right side of the surface with a refractive index of 1.6 and the radius of curvature of the surface is 0.05 m, which calculate the angle of incidence and refraction angles. Answer i = 21.8 degrees, i = 13.42 grams

2) What is the length of the small mirror in which a man of 180 cm in height can be full length? Answer 90cm

Please show the operation to both questions!