This exam consists of 32 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 97. The exam period was 90 minutes; the mean was 78.5; the median was 81. Click here to see page1 page2 of the formula sheet that came with the exam.

(a) faster than (b) at the same speed as (c) slower than

(a) always enlarged. (b) always reduced. (c) sometimes reduced, sometimes enlarged, depending upon the distance from the object to the mirror.

(a) A (from n=1.3 to n=1.4) (b) B (from n=1.4 to n=1.2)

A film of oil of thickness t is floating on water. The index of refraction is 1.0, 1.45, and 1.33 for air, oil, and water, respectively. A person views the film from the air in a direction normal to the surface.

The person sees that there is constructive interference of reflected light of wavelength 630 nm. What is the minimum thickness t of the oil film?

(a) 109 nm (b) 218 nm (c) 436 nm

(a) 155 nm (b) 225 nm (c) 310 nm

Which one of the rays for the converging lens shown is not correct?

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

(a) between the lens and the right focal point (b) at the right focal point (c) to the right of the right focal point

(a) virtual. (b) real.

(a) upright. (b) inverted.

An object is placed 10 cm in front of a convex mirror whose radius of curvature is 5 cm.

Where is the image located? (Be careful all answers can be obtained from numbers given in the problem.)

(a) 2 cm to the right of the mirror (b) 2 cm to the left of the mirror (c) 3.33 cm to the right of the mirror (d) 3.33 cm to the left of the mirror (e) No image will be formed.

(a) 0.2 cm (b) 1.0 cm (c) 5.0 cm

(a) 40° (b) 56.7° (c) 84.8°

Three identical converging lenses, each with a focal length of 10 cm, are laid out in a row as shown, each 30 cm apart. An object is placed 40 cm to the left of the first lens.

Where is the image due to just the first lens located?

(a) 13.3 cm to the left of the first lens (b) 13.3 cm to the right of the first lens (c) 20 cm to the right of the first lens

(a) 10 cm to the right of the third lens (b) 10 cm to the left of the third lens (c) 20 cm to the right of the third lens (d) 20 cm to the left of the third lens (e) 40 cm to the right of the third lens

(a) real. (b) virtual.

Which of the rays drawn above for the diverging lens shown is not correct?

(a) to the left of the left focal point (b) at the left focal point (c) between the left focal point and the lens (d) between the lens and the right focal point (e) to the right of the right focal point

(a) reduced. (b) enlarged.

Where will the image of the bead form?

(a) An image will form 10 cm to the left of the right mirror. (b) An image will form 20 cm to the right of the right mirror. (c) The only image will form infinitely far away.

A farsighted person has a near point of 75 cm from her eye.

She wants contact lenses that will let her see objects clearly at a distance of only 25 cm from her eye. Determine the focal length of the contact lenses.

(a) 18.75 cm (b) 37.5 cm (c) 75 cm

(a) yes (b) no

(a) 17.5 cm (b) 33.6 cm (c) 73 cm

(a) -25 cm (b) -525 cm (c) -550 cm

(a) 4,470 m (b) 5,500 m (c) 12,600 m

For a wavelength of 440 nm, a diffraction grating produces a 2nd-order bright fringe at an angle of 28°.

What is the slit spacing of the grating?

(a) 937 nm (b) 1,870 nm (c) 3,749 nm

(a) 308 nm (b) 314 nm (c) 627 nm

A double-slit experiment is set up using red light with a wavelength of 633 nm. The slits are separated by a distance of 0.075 mm. The interference pattern is viewed on a screen 1.8 m away from the slits.

What is the distance between two adjacent bright fringes on the screen?

(a) 1.52 cm (b) 1.69 cm (c) 3.04 cm

(a) 0.76 cm (b) 1.52 cm (c) 1.69 cm

(a) 633 nm (b) 950 nm (c) 1899 nm

(a) 1.5 cm (b) 1.7 cm (c) 3.0 cm