Dept. of Physics & Astronomy

Office: Watanabe Hall, Rm. 426, (808) 956-2922

E-mail: nassir @ hawaii.edu

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PHYS 152 Past Exams & Answers page*

**Part A**

**1.** T, T, F, F, T, F

**2a.** A

**2b.** C

**2c.** B

**3a.** B

**3b.** B

**3c.** D

**4a.** F

**4b.** F

**4c.** A (technically, although E was also accepted)

**Part B**

**1a.** A

**1b.** mag = -2.0 (d_i = 120 cm)

**1c.** object: 15 cm tall, upright, 60 cm to left of lens
center

image: 30 cm tall, inverted, 120 cm to right of lens center

include at least 2 of 3 principal rays: "P ray" (horizontal
to lens, then angling downward through focus to right of lens);
"M ray" (straight line directly through exact center
of lens and continuing on to right side); "F ray" (angling
downward through left-hand focus to lens, then horizontal on right
side of lens)

**2a.** Ray passes straight (no bending) into prism on bottom
edge; ray bends toward right as emerges from upper slanted side
of prism

**2b.** emerges at 72.7 degrees from the normal (ray strikes
inside of upper slanted side at theta_incident=45deg to the normal)

**2c.** critical angle = 38.7 degrees

**2d.** Ray passes straight (no bending) into prism on bottom
edge; ray reflects (total internal reflection) fromupper slanted
edge, staying inside prism, and reflecting directly to the right;
ray passes straight (no bending) out of right side of prism

**3a.** 0.693 m

**3b.** two-slit diffraction maxima occur at: x = -1.56 m,
0.00 m, +1.56 m

**3c.** E (two-slit diffraction minima occur at: x = -2.88
m, -0.71 m, +0.71 m, +2.88 m)