A thin film with index of refraction 1.5 is completely surrounded by air.
White light is nearly normally incident on the film from above and viewed by reflection.
A Galilean telescope uses the combination of a converging objective lens and a diverging eyepiece to produce an erect image. For this system, the image of the objective is typically formed on the back side of the diverging lens. The final image will then be erect, virtual, and in front of the eyepiece. The focal length of the objective, f o , is 100 cm. If the object distance is 30 m, locate the image formed by the objective lens.