Exam 34: Reflection, Refraction, and Optics

A person uses two microscopes to view the same object. Microscope A is twice as long as microscope B, and its lenses have focal lengths half as large as those in microscope B. The magnification provided by microscope B is

By changing the separation distance between lens and film, a camera can focus on subjects at a variety of distances. Assume that the lens-film separation for taking an in-focus picture of a distant object is d₀. To take an in-focus picture of a nearby object, the lens-film separation is

A double concave lens has radii of curvature of 15.0 cm and 10.0 cm. An object placed 14.0 cm from the lens forms a virtual image, twice as large as the object. The index of refraction of the material the lens is made of is

The apparent shape of the Sun near the horizon is

A lens is used to image an object onto a screen. When the upper half of the lens is covered,