Chapter Exam

Chapter-3 Light — Online MCQ Test

Q: What is the angle between the incident ray and the reflected ray called?

Answer: B. Angle of reflection — The angle between the incident ray and the reflected ray is related to the angles of incidence and reflection. The correct term asked here is the angle of reflection.

Q: Which law states that the angle of incidence is equal to the angle of reflection?

Answer: B. Law of reflection — The law of reflection states that the angle of incidence equals the angle of reflection, and the incident ray, reflected ray, and normal lie in the same plane.

Q: A ray of light strikes a plane mirror at an angle of 35° to the normal. What is the angle of reflection?

Answer: A. 35° — By the law of reflection, the angle of reflection is equal to the angle of incidence. So it is 35°.

Q: Which of the following is NOT a characteristic of the image formed by a plane mirror?

Answer: D. Can be obtained on a screen — A plane mirror forms a virtual image, so it cannot be obtained on a screen. The image is erect and the same size as the object.

Q: A ray of light makes an angle of 25° with the surface of a mirror. What is the angle between the incident ray and the reflected ray?

Answer: D. 130° — The ray makes 25° with the surface, so it makes 65° with the normal. The angle of reflection is also 65°, so the angle between incident and reflected rays is 130°.

SCIENCE · Samacheer Kalvi 8th · Tamil Nadu State Board

Practice Chapter-3 Light with a free chapter-wise online MCQ test for Tamil Nadu State Board Samacheer Kalvi 8th SCIENCE. This chapter covers: reflection refraction lens vision Explains reflection refraction lenses and the functioning of the human eye. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter-3 Light — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board Samacheer Kalvi 8th SCIENCE — Chapter-3 Light, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the angle between the incident ray and the reflected ray called?

A. Angle of incidence
B. Angle of reflection ✓
C. Angle of deviation
D. Angle of rotation

Answer: B. Angle of reflection
The angle between the incident ray and the reflected ray is related to the angles of incidence and reflection. The correct term asked here is the angle of reflection.

Which law states that the angle of incidence is equal to the angle of reflection?

A. Law of refraction
B. Law of reflection ✓
C. Law of dispersion
D. Law of magnification

Answer: B. Law of reflection
The law of reflection states that the angle of incidence equals the angle of reflection, and the incident ray, reflected ray, and normal lie in the same plane.

A ray of light strikes a plane mirror at an angle of 35° to the normal. What is the angle of reflection?

A. 35° ✓
B. 55°
C. 70°
D. 90°

Answer: A. 35°
By the law of reflection, the angle of reflection is equal to the angle of incidence. So it is 35°.

Which of the following is NOT a characteristic of the image formed by a plane mirror?

A. Virtual
B. Erect
C. Same size as the object
D. Can be obtained on a screen ✓

Answer: D. Can be obtained on a screen
A plane mirror forms a virtual image, so it cannot be obtained on a screen. The image is erect and the same size as the object.

A ray of light makes an angle of 25° with the surface of a mirror. What is the angle between the incident ray and the reflected ray?

A. 25°
B. 50°
C. 65°
D. 130° ✓

Answer: D. 130°
The ray makes 25° with the surface, so it makes 65° with the normal. The angle of reflection is also 65°, so the angle between incident and reflected rays is 130°.

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