This exam consists of 31 questions; true-false questions are worth 2 points each, three-choice multiple choice questions are worth 3 points each, five-choice multiple choice questions are worth 6 points each. The maximum possible score is 118. When the exam was given, the mean was 90.7; the median was 92. Click here to see page1 page2 of the formula sheet that came with the exam.

What part of his body does the person see in the mirror?

(a) top 0.25 m (b) top 0.5 m (c) top 1 m (d) top 1.5 m (e) entire 2 m

(a) (b) (c) (d) (e)

(a) 2.0 (b) 1.7 (c) 1.5 (d) 1.3 (e) 1.0

(a) greater than 8 cm. (b) equal to 8 cm. (c) less than 8 cm.

An object of 5 cm height is at a position 15 cm away from a spherical concave mirror. The radius of curvature for the mirror is 20 cm. The locations of the center of curvature (C) and the focal point (F) are indicated.

How far will the image be from the mirror?

(a) 15 cm (b) 20 cm (c) 25 cm (d) 30 cm (e) 35 cm

(a) 2.5 cm (b) 5.0 cm (c) 10 cm

(a) upright. (b) inverted.

The object (the arrow) and a diverging lens are positioned as shown in the figure. The locations of the focal points are indicated by F. This figure (but not necessarily any other figure in this exam) has been carefully drawn to scale.

(a) A (b) B (c) C

(a) enlarged (b) reduced (c) same size as the object

(a) It will move toward the lens. (b) It will move away from the lens.

Two lenses are separated by 11 cm. Lens #1 is a converging lens and its focal length is 4 cm. Lens #2 is also a converging lens with 5 cm focal length. An object (arrow) is located 8 cm to the left of lens #1.

If lens #2 were not present, the image formed by lens #1 would be

(a) 12 cm to the left of lens #1. (b) 4 cm to the left of lens #1. (c) 4 cm to the right of lens #1. (d) 8 cm to the right of lens #1. (e) 12 cm to the right of lens #1.

(a) 3 cm to the left of lens #1 (b) 3.5 cm to the right of lens #1 (c) 6 cm to the left of lens #2 (d) 4.5 cm to the left of lens #2 (e) 1.5 cm to the right of lens #2

(a) inverted relative to the object. (b) upright relative to the object.

(a) yes (b) no

A ray of red light passes through a series of media with different refractive indices, n_{1}, n_{2} and n_{3}. It then enters a medium with an index of refraction n_{1} as shown.

In what medium does the light travel the fastest ?

(a) medium with index n_{1} (b) medium with index n_{2} (c) medium with index n_{3}

(a) to the right of where the red ray emerged. (b) at the same point as where the red ray emerged. (c) to the left of where the red ray emerged.

(a) 34° (b) 49° (c) 65°

The nearest point at which my friend can read text without the aid of glasses is 250 cm. To read a book held at 30 cm distance, my friend must use eyeglasses.

The eyeglasses should be

(a) converging lens. (b) diverging lens.

(a) 29.1 cm (b) 34.1 cm (c) 37.1 cm

An object is placed an unknown distance (x cm) in front of a convex mirror with a focal length f = -5 cm. The locations of the focal point (F) and the center of curvature (C) are shown.

Which one of the following statements is wrong?

(a) Rays of actual light always meet to form the image. (b) The image is always upright. (c) The image is always reduced in size.

(a) 2.5 cm (b) 5 cm (c) 7.5 cm (d) 10 cm (e) 15 cm

Light with frequency f = 5.5 × 10^{14} Hz is incident upon two narrow slits separated by a distance 0.8 × 10^{-3} m before striking a screen 4.2 meters away.

Calculate h, the distance between the central and first bright fringe.

(a) h = 2.1 × 10^{-3} m (b) h = 2.9 × 10^{-3} m (c) h = 4.3 × 10^{-3} m (d) h = 7.2 × 10^{-3} m (e) h = 8.6 × 10^{-3} m

(a) increases (b) remains the same (c) decreases

(a) increases (b) remain the same (c) decreases

A thin layer of carbon disulfide (n = 1.6) is resting upon two blocks. The first block is made of ice (n = 1.3) and the material of the other is block is unknown. When viewed from above, green light (l_{0} = 550 nm in air, f = 5.5 × 10^{14} Hz) constructively interferes off the left side (ice block), and destructively interferes off the right side (unknown block).

What is a possible thickness t of the thin layer of carbon disulfide?

(a) t = ½ l_{0} (b) t = ½ l_{0} / n_{1} (c) t = ¼ l_{0} / n_{1} (d) t = ½ l_{0} / n_{2} (e) t = ¼ l_{0} / n_{2}

(a) diamond (b) crown glass (c) ice

An inkjet color printer uses tiny dots of red (l = 660 nm), green (l = 550 nm) and blue (l = 470 nm) ink to produce an image. At normal viewing distances, the eye cannot resolve these dots. You thus see a "smooth" picture.

If each dot is the same size, which color dots are the easiest to resolve?

(a) red (b) green (c) blue

(a) 44 µm (b) 65 µm (c) 84 µm (d) 110 µm (e) 128 µm

Monochromatic light shines on a diffraction grating with 9600 lines/cm. The first-order maximum occurs at an angle of 33 degrees.

What is the wavelength of the light?

(a) l = 865 nm (b) l = 683 nm (c) l = 567 nm

(a) 1 (b) 2 (c) 3

The separation between the slits is:

(a) 7 mm (b) 14 mm (c) 28 mm