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PHYS 112 – Optics: Reflection, Refraction & Lenses Question Practice Test with Answers, Calculations & Detailed Explanations

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PHYS 112 – Optics: Reflection, Refraction & Lenses Question Practice Test with Answers, Calculations & Detailed Explanations

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Prepare for PHYS 112 – General Physics II with this 100-question practice test focused on optics. Topics include reflection, plane and spherical mirrors, Snell’s law, refraction, critical angle, total internal reflection, apparent depth, thin lenses, magnification, image formation, lens power, and lens combinations. Every question includes the correct answer and a detailed explanation, with worked calculations where needed.

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PASSPOINTPRO

PHYS 112
GENERAL PHYSICS II

OPTICS:
REFLECTION, REFRACTION
& LENSES
100-Question Practice Test

100 83 17
QUESTIONS CALCULATION-BASED CONCEPTUAL

COVERAGE

Reflection & plane mirrors | Spherical mirrors | Snell law & refraction

Critical angle & TIR | Apparent depth | Thin lenses & magnification

Lens power & combinations | Correct answer + detailed explanation

PassPointPro | Focused practice. Clear reasoning. Confident preparation.

,PHYS 112 | GENERAL PHYSICS II FORMULA REFERENCE

Formula Reference
Core relationships used throughout this practice test

REFLECTION theta_i = theta_r plane mirror: |d_i| = d_o

SPHERICAL MIRRORS 1/f = 1/d_o + 1/d_i f = R/2 m = -d_i/d_o

SNELL LAW n1 sin(theta1) = n2 sin(theta2) n = c/v

CRITICAL ANGLE sin(theta_c) = n2/n1 (for n1 > n2)

APPARENT DEPTH d_app approximately d_real/n for near-normal viewing from air

THIN LENSES 1/f = 1/d_o + 1/d_i m = -d_i/d_o = h_i/h_o

OPTICAL POWER P = 1/f(meters) P_eq = P1 + P2 for thin lenses in contact

SIGN-CONVENTION NOTE
Positive image distance is real; negative image distance is virtual. Negative magnification means inverted.

PassPointPro | PHYS 112 General Physics II Page 2

,PHYS 112 | GENERAL PHYSICS II OPTICS: REFLECTION, REFRACTION & LENSES

Question 1 REFLECTION FUNDAMENTALS

An object is 18 cm in front of a plane mirror. How far behind the mirror is its image?
9 cm
A
36 cm
B
-18 cm
C
18 cm
D

Answer: D

Explanation:
For a plane mirror, image distance equals object distance. The image forms the same distance behind the mirror as the
object is in front, so d_i=18 cm.

Question 2 REFLECTION FUNDAMENTALS

An object is 24 cm in front of a plane mirror. How far behind the mirror is its image?
24 cm
A
12 cm
B
48 cm
C
-24 cm
D

Answer: A

Explanation:
For a plane mirror, image distance equals object distance. The image forms the same distance behind the mirror as the
object is in front, so d_i=24 cm.

PassPointPro | PHYS 112 General Physics II Page 3

, PHYS 112 | GENERAL PHYSICS II OPTICS: REFLECTION, REFRACTION & LENSES

Question 3 REFLECTION FUNDAMENTALS

An object is 32 cm in front of a plane mirror. How far behind the mirror is its image?
-32 cm
A
32 cm
B
16 cm
C
64 cm
D

Answer: B

Explanation:
For a plane mirror, image distance equals object distance. The image forms the same distance behind the mirror as the
object is in front, so d_i=32 cm.

Question 4 REFLECTION FUNDAMENTALS

An object is 45 cm in front of a plane mirror. How far behind the mirror is its image?
90 cm
A
-45 cm
B
45 cm
C
22.5 cm
D

Answer: C

Explanation:
For a plane mirror, image distance equals object distance. The image forms the same distance behind the mirror as the
object is in front, so d_i=45 cm.

PassPointPro | PHYS 112 General Physics II Page 4

Document information

Uploaded on: September 14, 2026
Number of pages: 52
Written in: 2026/2027
Type: Exam (elaborations)
Contains: Questions & answers

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