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
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
