Exam 26: The Refraction of Light: Lenses and Optical Instruments

The right lens of Josh's contact lenses is a converging lens of +2.50 diopters.He can read a book held as close as 25 cm from his eyes.Complete the following statement: Without his lenses, Josh's right eye has

The leg of a spider is 0.2 cm long.When viewed through a microscope, a person with a near point of 25 cm sees an image 2 m long located 10 m away.What is the angular magnification?

What is the Brewster angle when light is reflected from a plastic plate (n = 1.575) submerged in ethyl alcohol (n = 1.362)?

26-9 Two converging lenses, each with a focal length of 0.080 m, are used in combination to form an image of an object that is located 0.24 m to the left of the left lens in the pair.The distance between the lenses is 0.16 m. -What is the total magnification of this lens combination?

A beam of light passes from air into water.Which is necessarily true?

An object is placed 20.0 cm from a converging lens with focal length 15 cm.A concave mirror with focal length 10 cm is located 75 cm to the right of the lens as shown in the figure.Note: The figure is not drawn to scale. -Determine the location of the final image.

Complete the following statement: The term dispersion refers to the fact that the index of refraction of certain materials

When an object is placed 15 cm from a lens, a virtual image is formed.Which one of the following conclusions is incorrect?

A fish swims 2.00 m below the surface of a pond.At what apparent depth does the fish appear to swim if viewed from directly above? The index of refraction of water is 1.33.

The compound microscope discussed in Cutnell and Johnson's text is made from two lenses.Which one of the following statements is true concerning the operation of this microscope?

The figure is a scaled diagram of an object and a converging lens surrounded by air.Only one focal point, F, of the lens is shown. -The system is immersed in a fluid other than air that has an index of refraction that is larger than that of the lens.Which one of the following statements is true concerning this new situation?

26-6 A diverging lens has a focal length of -15 cm.A 5-cm object is placed 35 cm from the lens. -Which pair of terms most accurately describes the image?

A beam of light that consists of a mixture of red, green and violet light strikes a prism (surrounded by air) as shown.Indices of refraction for this prism for the various colors are indicated in the table.An observer is located to the right of the prism as shown. -Which physical phenomenon is illustrated by the fact that the observer will not see all three colors of light?

A stamp collector used a magnifying glass with a focal length of 24.0 cm to observe his favorite stamp .The image of the stamp was located at his near point distance of 30.0 cm.What was the approximate angular magnification of the magnifying glass when the collector observed his stamp?

Rachel has a far point of 5 m.Which statement below concerning Rachel's vision is true?

The figure shows the path of a ray of light as it travels through air and crosses a boundary into water.The index of refraction of water for this light is 1.33. -What is the speed of this ray of light as it travels through the water?

The length of the wing of an insect is 1 mm.When viewed through a microscope, the image is 1 m long and located 5 m away.Determine the angular magnification if the observer's near point of 25 cm.

The figure shows a point source of unpolarized light at A inside a uniform transparent crystal.The ray AO in the crystal strikes the plane surface SS' making an angle of 30° with the normal.This angle is the critical angle for transmission into air. -Determine the index of refraction of the crystal.

The figure shows a point source of unpolarized light at A inside a uniform transparent crystal.The ray AO in the crystal strikes the plane surface SS' making an angle of 30° with the normal.This angle is the critical angle for transmission into air. -For what angle of incidence will the reflected rays of light be completely polarized?

The figure is a scaled diagram of an object and a converging lens surrounded by air.Only one focal point, F, of the lens is shown. -The index of refraction of this lens is 1.51 for red light and 1.53 for blue light.Blue light is focused at the point F.Which one of the following statements is true concerning the focal point for red light?