Reflection and Refraction of Light for Competitive Exams

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Reflection and Refraction of Light

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Reflection and Refraction of Light MCQ & Objective Questions

The concepts of Reflection and Refraction of Light are fundamental in physics and play a crucial role in various examinations. Mastering these topics not only enhances your understanding but also boosts your confidence in tackling MCQs and objective questions. Regular practice with these important questions can significantly improve your exam preparation and help you score better.

What You Will Practise Here

Understanding the laws of reflection and refraction.
Key formulas related to angles of incidence, reflection, and refraction.
Concept of critical angle and total internal reflection.
Applications of reflection and refraction in daily life.
Ray diagrams for lenses and mirrors.
Numerical problems involving refractive indices.
Definitions of key terms such as concave, convex, and plane surfaces.

Exam Relevance

The topic of Reflection and Refraction of Light is frequently featured in CBSE, State Boards, NEET, and JEE exams. Students can expect questions that require both theoretical understanding and practical application of concepts. Common question patterns include numerical problems, conceptual MCQs, and diagram-based questions, making it essential to have a solid grasp of the subject.

Common Mistakes Students Make

Confusing the laws of reflection with those of refraction.
Miscalculating angles when applying Snell's law.
Overlooking the significance of the critical angle in total internal reflection.
Failing to draw accurate ray diagrams for lenses and mirrors.
Neglecting to understand the difference between real and virtual images.

FAQs

Question: What is the law of reflection?
Answer: The law of reflection states that the angle of incidence is equal to the angle of reflection.

Question: How does refraction occur?
Answer: Refraction occurs when light passes from one medium to another, causing a change in its speed and direction.

Question: What is total internal reflection?
Answer: Total internal reflection happens when light travels from a denser medium to a rarer medium at an angle greater than the critical angle, resulting in all light being reflected back.

Now is the time to enhance your understanding of Reflection and Refraction of Light. Dive into our practice MCQs and test your knowledge to excel in your exams!

Q. If light travels from air (n=1) into water (n=1.33), what happens to its speed?

A. It increases
B. It decreases
C. It remains the same
D. It doubles

Solution

The speed of light decreases when it enters a medium with a higher refractive index.

Correct Answer: B — It decreases

Q. In which situation does light undergo total internal reflection?

A. When it passes from air to water
B. When it passes from water to air at an angle greater than the critical angle
C. When it passes from glass to air at any angle
D. When it passes from air to glass

Solution

Total internal reflection occurs when light travels from a denser medium to a less dense medium at an angle greater than the critical angle.

Correct Answer: B — When it passes from water to air at an angle greater than the critical angle

Q. In which situation does total internal reflection occur?

A. When light travels from a denser to a rarer medium
B. When light travels from a rarer to a denser medium
C. When light is absorbed
D. When light is reflected

Solution

Total internal reflection occurs when light travels from a denser medium to a rarer medium at an angle greater than the critical angle.

Correct Answer: A — When light travels from a denser to a rarer medium

Q. What happens to the frequency of light when it passes from one medium to another?

A. It increases
B. It decreases
C. It remains the same
D. It becomes zero

Solution

The frequency of light remains constant when it passes from one medium to another; only the speed and wavelength change.

Correct Answer: C — It remains the same

Q. What happens to the wavelength of light as it enters a medium with a higher refractive index?

A. It increases
B. It decreases
C. It remains the same
D. It doubles

Solution

The wavelength decreases as light enters a medium with a higher refractive index.

Correct Answer: B — It decreases

Q. What is the critical angle for total internal reflection from glass (n=1.5) to air (n=1)?

A. 41.8 degrees
B. 48.6 degrees
C. 60 degrees
D. 90 degrees

Solution

The critical angle can be calculated using sin(θc) = n2/n1, which gives θc = sin^(-1)(1/1.5) = 41.8 degrees.

Correct Answer: A — 41.8 degrees

Q. What is the effect of a prism on white light?

A. Reflection
B. Refraction
C. Dispersion
D. Absorption

Solution

A prism disperses white light into its constituent colors due to refraction.

Correct Answer: C — Dispersion

Q. What is the effect of increasing the wavelength of light on the angle of refraction when entering a medium?

A. It increases the angle
B. It decreases the angle
C. It has no effect
D. It causes total internal reflection

Solution

Increasing the wavelength generally increases the angle of refraction due to the change in refractive index.

Correct Answer: A — It increases the angle

Q. What is the law that describes the relationship between the angles of incidence and refraction?

A. Snell's Law
B. Newton's Law
C. Hooke's Law
D. Faraday's Law

Solution

Snell's Law states that n1 * sin(θ1) = n2 * sin(θ2), where n is the refractive index and θ is the angle.

Correct Answer: A — Snell's Law

Q. What is the refractive index of a medium if the speed of light in vacuum is 3 x 10^8 m/s and in the medium is 2 x 10^8 m/s?

A. 1.5
B. 0.67
C. 2.0
D. 1.0

Solution

The refractive index n is calculated as n = c/v, which gives n = (3 x 10^8)/(2 x 10^8) = 1.5.

Correct Answer: A — 1.5

Q. What is the term for the bending of light as it passes from one medium to another?

A. Reflection
B. Refraction
C. Diffraction
D. Dispersion

Solution

Refraction is the change in direction of light due to a change in its speed when entering a different medium.

Correct Answer: B — Refraction

Q. What type of lens is used to converge light rays?

A. Concave lens
B. Convex lens
C. Cylindrical lens
D. Biconcave lens

Solution

A convex lens is designed to converge light rays to a focal point.

Correct Answer: B — Convex lens

Q. Which optical instrument uses refraction to magnify objects?

A. Telescope
B. Periscope
C. Microscope
D. All of the above

Solution

All of these instruments use refraction to magnify objects.

Correct Answer: D — All of the above

Q. Which phenomenon occurs when light passes through a narrow slit and spreads out?

A. Reflection
B. Refraction
C. Diffraction
D. Interference

Solution

Diffraction is the bending of waves around obstacles and openings.

Correct Answer: C — Diffraction

Q. Which phenomenon occurs when light waves pass through a narrow slit?

A. Reflection
B. Refraction
C. Diffraction
D. Interference

Solution

Diffraction occurs when light waves encounter an obstacle or slit that is comparable in size to their wavelength.

Correct Answer: C — Diffraction

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