Reflection AP Physics 2 MCQ – Exam Style Questions etc.
Reflection AP Physics 2 MCQ
Unit 13: Geometric and Physical Optics
Weightage : 15–18%
Exam Style Practice Questions , Reflection AP Physics 2 MCQ
Question
As the angle of incidence for a ray of light passing from glass to air increases, the critical angle of incidence for the glass
(A) increases
(B) decreases
(C) increases and then decreases
(D) remains the same
Answer/Explanation
Ans:(D)
The critical angle is set by the ratio of the indices of refraction.
Question
Which of the following can produce polarized light? Select two answers.
(A) A liquid crystal display (LCD)
(B) Reflection
(C) Refraction
(D) Fluorescent bulbs
Answer/Explanation
Ans:(A) and ( B )
LCD by nature of the long-chain molecules involved emit polarized light. Reflected light can be partially or completely polarized depending on the angle.
Question
A light ray is incident on a glass-air interface as shown above. Which path will the light ray follow after it enters the air?
(A) A or B
(B) B or C
(C) E
(D) D
Answer/Explanation
Ans:(C)
From moving from glass to air, light will speed up. As the light speeds up, it will pivot away from the normal.
Question
Light of frequency \(1.5 × 10^{14}\) Hz travels through air and enters glass perpendicular to its surface. Which of the following changes occur to the ray of light as it enters the glass? Choose two correct answers.
(A) wavelength decreases
(B) speed of the ray of light decreases
(C) light ray bends toward the normal
(D) frequency of the ray of light increases
Answer/Explanation
Ans: (A) and (B)
A is correct because wavelength is inversely proportional to the index of refraction.
B is correct because the velocity is inversely proportional to the index of refraction.
C is incorrect because no refraction occurs when the angle of incidence is 0 degrees.
D is incorrect because frequency depends on the source of light.
Question
Light of wavelength λ in a vacuum has what wavelength in a material with index of refraction n?
(A) \(nλ\)
(B) \(\frac{ n}{ λ}\)
(C) \(\frac{ λ}{ n}\)
(D) \(\frac{ n}{c λ}\)
Answer/Explanation
Ans: (C)
