Ray Optics and Optical Instruments Practice Questions
Class 12 · Physics · 2594 free MCQs with instant results and detailed explanations.
2594
Total
899
Easy
1278
Medium
417
Hard
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Topics in Ray Optics and Optical Instruments
Reflection
655
Optical Instruments
720
Total Internal Reflection
622
Refraction
597
Sample Questions from Ray Optics and Optical Instruments
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
What is the angle of incidence if a ray of light strikes a plane mirror at an angle of 30 degrees with the normal?
A.
30 degrees
B.
60 degrees
C.
90 degrees
D.
45 degrees
Show Answer & Explanation
Correct Answer: A
The angle of incidence is the angle between the incident ray and the normal at the surface. Here, it is given as 30 degrees.
Q2
Easy
When light reflects off a surface, which of the following statements is true according to the law of reflection?
A.
The angle of reflection is always less than the angle of incidence.
B.
The angle of incidence is equal to the angle of reflection.
C.
The angle of incidence is zero.
D.
The angles of incidence and reflection are always complementary.
Show Answer & Explanation
Correct Answer: B
According to the law of reflection, the angle of incidence is always equal to the angle of reflection.
Q3
Easy
A ray of light strikes a plane mirror at an angle of 45 degrees to the normal. What will be the angle of reflection?
A.
45 degrees
B.
90 degrees
C.
135 degrees
D.
60 degrees
Show Answer & Explanation
Correct Answer: A
According to the law of reflection, the angle of reflection equals the angle of incidence. Thus, if the angle of incidence is 45 degrees, the angle of reflection is also 45 degrees.
Q4
Medium
What is the angle of reflection if a ray of light strikes a plane mirror at an angle of 30°?
A.
30°
B.
60°
C.
45°
D.
90°
Show Answer & Explanation
Correct Answer: A
According to the law of reflection, the angle of reflection is equal to the angle of incidence.
Q5
Medium
In a plane mirror, the image formed is always:
A.
Real and inverted
B.
Virtual and erect
C.
Real and erect
D.
Virtual and inverted
Show Answer & Explanation
Correct Answer: B
A plane mirror forms a virtual image which is always erect and placed behind the mirror.
Q6
Medium
When a beam of light passes from air into water, which of the following correctly describes the change in its speed?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Varies with angle
Show Answer & Explanation
Correct Answer: B
Light travels slower in water than in air due to a higher refractive index.
Q7
Medium
What is the focal length of a convex lens if it produces an image of an object at the same distance as the object from the lens?
A.
Positive
B.
Negative
C.
Zero
D.
Infinity
Show Answer & Explanation
Correct Answer: A
The focal length of a convex lens is positive, confirming its nature and operation.
Q8
Hard
If a plane mirror has a height of 1.5 m, what is the maximum height of an object that can be fully seen in the mirror?
A.
1.5 m
B.
3 m
C.
0.75 m
D.
2 m
Show Answer & Explanation
Correct Answer: B
To see their full height in a plane mirror, the object must be twice the height of the mirror's reflection, hence 3 m.
Q9
Hard
What is the angle of incidence for a light ray striking a plane mirror if the angle of reflection is 55 degrees?
A.
45 degrees
B.
55 degrees
C.
110 degrees
D.
90 degrees
Show Answer & Explanation
Correct Answer: B
According to the law of reflection, angle of incidence equals angle of reflection. Thus, it is also 55 degrees.
Q10
Hard
An object is placed at the center of curvature of a concave mirror. Where will the image be formed?
A.
At the center of curvature
B.
At the focus
C.
Between the center and focus
D.
At infinity
Show Answer & Explanation
Correct Answer: A
When the object is at the center of curvature, the image is formed at the same point, which is also the center of curvature.
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Ray Optics and Optical Instruments — Class 12 Physics Practice Questions Online
This page contains 2594 practice MCQs for the chapter Ray Optics and Optical Instruments in Class 12 Physics. The questions are organized by difficulty — 899 easy, 1278 medium, 417 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 4 topics, giving you comprehensive coverage of the entire chapter.