When two plane mirrors are parallel, such as on opposite walls in a barber shop, multiple images arise because each image in one mirror serves as an object for the other mirror. A point object is placed between parallel mirrors separated by 30 cm. The object is 10 cm in front of the left mirror and 20 cm in front of the right mirror.

(a) Find the distance from the left mirror to the first four images in that mirror.

(b) Find the distance from the right mirror to the first four images in that mirror.