Optics Practice Questions
JEE · Physics · 1410 free MCQs with instant results and detailed explanations.
1410
Total
336
Easy
631
Medium
443
Hard
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Topics in Optics
Diffraction
379
Wave Optics
334
Interference
384
Ray Optics
313
Sample Questions from Optics
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
When light travels from air into glass, which of the following statements is true?
A.
The speed of light increases.
B.
The speed of light remains constant.
C.
The speed of light decreases.
D.
The light reflects off the surface.
Show Answer & Explanation
Correct Answer: C
When light enters a denser medium like glass from air, its speed decreases due to the higher refractive index of glass compared to air.
Q2
Easy
A ray of light strikes a plane mirror at an angle of incidence of 30 degrees. What is the angle of reflection?
A.
15 degrees
B.
30 degrees
C.
45 degrees
D.
60 degrees
Show Answer & Explanation
Correct Answer: B
According to the law of reflection, the angle of reflection is equal to the angle of incidence. Thus, if the angle of incidence is 30 degrees, the angle of reflection is also 30 degrees.
Q3
Easy
If a beam of light passes through a prism, which of the following phenomena is primarily responsible for the separation of colors?
A.
Reflection
B.
Refraction
C.
Diffraction
D.
Interference
Show Answer & Explanation
Correct Answer: B
The separation of colors in a prism occurs due to refraction, as different wavelengths of light bend at different angles when passing through the prism.
Q4
Medium
A ray of light passes from air into water at an angle of incidence of 30 degrees. What is the angle of refraction in water? (Refractive index of water = 1.33)
A.
22.6 degrees
B.
30 degrees
C.
40 degrees
D.
23.5 degrees
Show Answer & Explanation
Correct Answer: A
Using Snell's law, n1 * sin(theta1) = n2 * sin(theta2), we can find the angle of refraction in water from the given angle of incidence.
Q5
Medium
An object is placed 15 cm in front of a convex lens with a focal length of 10 cm. What is the nature and position of the image formed?
A.
Real and inverted at 30 cm
B.
Virtual and upright at 30 cm
C.
Real and inverted at 20 cm
D.
Virtual and upright at 20 cm
Show Answer & Explanation
Correct Answer: C
Using the lens formula 1/f = 1/v - 1/u, we find the image distance (v) is 20 cm, indicating a real and inverted image.
Q6
Medium
Light travels from air into water. If the angle of incidence in air is 30 degrees, what is the angle of refraction in water? (n_air = 1, n_water = 1.33)
A.
22.3 degrees
B.
23.5 degrees
C.
28.5 degrees
D.
30 degrees
Show Answer & Explanation
Correct Answer: A
Using Snell's law n1 * sin(i) = n2 * sin(r), we calculate r and find it to be approximately 22.3 degrees.
Q7
Medium
What type of lens would be used to correct hyperopia (farsightedness)?
A.
Concave lens
B.
Convex lens
C.
Cylindrical lens
D.
Biconcave lens
Show Answer & Explanation
Correct Answer: B
A convex lens is used to converge light rays before they reach the eye, correcting hyperopia.
Q8
Hard
A beam of light passes from air into a medium with refractive index 1.5. If the angle of incidence in air is 30 degrees, what is the angle of refraction in the medium?
A.
19.1 degrees
B.
20.5 degrees
C.
22.6 degrees
D.
25.0 degrees
Show Answer & Explanation
Correct Answer: A
Using Snell's Law, n1 * sin(theta1) = n2 * sin(theta2). Here, n1 = 1 (air), n2 = 1.5 (medium), theta1 = 30 degrees, we find theta2 = sin^(-1)(sin(30)/1.5).
Q9
Hard
A light ray strikes a glass block (n = 1.5) at an angle of incidence of 60 degrees. What is the critical angle for this interface?
A.
41.8 degrees
B.
30.0 degrees
C.
60.0 degrees
D.
50.0 degrees
Show Answer & Explanation
Correct Answer: A
The critical angle (C) can be calculated using C = sin^(-1)(n2/n1). At the air-glass interface, n1 = 1 (air) and n2 = 1.5.
Q10
Hard
A ray of light traveling in water (n = 1.33) enters a glass prism with a refractive index of 1.5 at an angle of incidence of 45 degrees. What is the angle of refraction in the glass?
A.
28.5 degrees
B.
33.5 degrees
C.
24.5 degrees
D.
30.0 degrees
Show Answer & Explanation
Correct Answer: B
Using Snell’s Law, n1 * sin(theta1) = n2 * sin(theta2), we can find theta2 for the water-glass interface.
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Optics — JEE Physics Practice Questions Online
This page contains 1410 practice MCQs for the chapter Optics in JEE Physics. The questions are organized by difficulty — 336 easy, 631 medium, 443 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.