Optics Practice Questions
NEET · Physics · 1650 free MCQs with instant results and detailed explanations.
1650
Total
393
Easy
729
Medium
528
Hard
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Topics in Optics
Reflection
220
Refraction
193
Total Internal Reflection
180
Lenses and Mirrors
189
Optical Instruments
212
Wave Optics
219
Interference
208
Diffraction
229
Sample Questions from Optics
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
What is the angle of reflection if a light ray strikes a mirror at an angle of 30 degrees?
A.
30 degrees
B.
60 degrees
C.
90 degrees
D.
45 degrees
Show Answer & Explanation
Correct Answer: A
According to the law of reflection, the angle of reflection is equal to the angle of incidence. Since the angle of incidence is 30 degrees, the angle of reflection is also 30 degrees.
Q2
Easy
A concave mirror forms an image of a candle placed 10 cm away from it. If the focal length of the mirror is 5 cm, what is the nature of the image formed?
A.
Real and inverted
B.
Virtual and upright
C.
Real and upright
D.
Virtual and inverted
Show Answer & Explanation
Correct Answer: A
For a concave mirror, if the object is placed beyond the focal point but within twice the focal length, the image formed is real and inverted. Here, the object distance (10 cm) is greater than the focal length (5 cm).
Q3
Easy
When light reflects off a smooth surface, what type of reflection occurs?
A.
Diffused reflection
B.
Regular reflection
C.
Scattered reflection
D.
Partial reflection
Show Answer & Explanation
Correct Answer: B
Regular reflection occurs when light rays reflect off a smooth surface, such as a mirror, producing a clear image. In contrast, diffused reflection occurs on rough surfaces.
Q4
Medium
What is the angle of reflection when a ray of light strikes a plane mirror at an angle of 30° to the normal?
A.
30°
B.
60°
C.
90°
D.
45°
Show Answer & Explanation
Correct Answer: A
According to the law of reflection, the angle of reflection is equal to the angle of incidence. Since the ray strikes the mirror at 30° to the normal, the reflection will also be 30°.
Q5
Medium
A concave mirror produces a real image of a 5 cm tall object placed 10 cm from the mirror. If the distance of the image from the mirror is 15 cm, what is the height of the image?
A.
10 cm
B.
7.5 cm
C.
5 cm
D.
12.5 cm
Show Answer & Explanation
Correct Answer: B
Using the magnification formula m = -v/u, where v is the image distance (15 cm) and u is the object distance (10 cm), we find m = -15/(-10) = 1.5. Therefore, height of the image = height of object * magnification = 5 cm * 1.5 = 7.5 cm.
Q6
Medium
A ray of light strikes a plane mirror at an angle of 45°. If the mirror is rotated by 20° about its axis, what will be the change in the angle of reflection?
A.
20°
B.
40°
C.
60°
D.
10°
Show Answer & Explanation
Correct Answer: B
When the mirror is rotated by 20°, the angle of reflection changes by twice this angle due to the law of reflection. Therefore, the change in the angle of reflection is 2 * 20° = 40°.
Q7
Medium
If a concave mirror has a focal length of 20 cm, where should an object be placed to produce an image at a distance of 10 cm from the mirror?
A.
30 cm
B.
15 cm
C.
20 cm
D.
25 cm
Show Answer & Explanation
Correct Answer: A
Using the mirror formula 1/f = 1/v + 1/u, substituting f = -20 cm (for concave), and v = -10 cm (real image), we have 1/-20 = 1/-10 + 1/u, solving gives u = -30 cm, meaning the object should be placed 30 cm in front of the mirror.
Q8
Hard
A concave mirror has a focal length of 20 cm. If an object is placed 30 cm away from the mirror, where will the image be formed?
A.
60 cm in front of the mirror
B.
15 cm in front of the mirror
C.
10 cm behind the mirror
D.
20 cm behind the mirror
Show Answer & Explanation
Correct Answer: A
Using the mirror formula 1/f = 1/v + 1/u, where f = -20 cm (concave mirror), u = -30 cm (object distance). Solving gives v = 60 cm, indicating the image is formed in front of the mirror.
Q9
Hard
A concave mirror forms a virtual image of an object placed 10 cm in front of it. If the focal length of the mirror is 5 cm, what is the distance of the image from the mirror?
A.
3.33 cm
B.
5 cm
C.
15 cm
D.
6.67 cm
Show Answer & Explanation
Correct Answer: A
Using the mirror formula 1/f = 1/v + 1/u, where f is the focal length, v is the image distance, and u is the object distance. Rearranging gives us v = fu/(u - f). Substituting values (f = -5 cm, u = -10 cm) yields v = 3.33 cm.
Q10
Hard
When light reflects off a surface at an angle of 45 degrees, what is the angle of reflection?
A.
0 degrees
B.
45 degrees
C.
90 degrees
D.
30 degrees
Show Answer & Explanation
Correct Answer: B
According to the law of reflection, the angle of incidence is equal to the angle of reflection. If the angle of incidence is 45 degrees, the angle of reflection must also be 45 degrees.
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Optics — NEET Physics Practice Questions Online
This page contains 1650 practice MCQs for the chapter Optics in NEET Physics. The questions are organized by difficulty — 393 easy, 729 medium, 528 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 8 topics, giving you comprehensive coverage of the entire chapter.