Chapter Exam

Chapter 2: Ray Optics and Optical Instruments — Online MCQ Test

Q: Which of the following is the SI unit of the power of a lens?

Answer: A. dioptre — The power of a lens is measured in dioptres (D), where 1 D = 1 m^-1. It indicates the converging or diverging ability of the lens.

Q: A ray of light passes from glass to air. Which of the following is true when the angle of incidence is greater than the critical angle?

Answer: C. The ray is totally internally reflected — When light travels from a denser to a rarer medium and the incidence angle exceeds the critical angle, total internal reflection takes place. No refraction occurs into the rarer medium.

Q: Which of the following statements about a concave mirror is NOT correct?

Answer: C. It always forms an erect image — A concave mirror can form both real and virtual images depending on object position, and the image may be erect or inverted. Therefore, it does not always form an erect image.

Q: A prism of angle A produces minimum deviation δm for a ray. Which relation is correct for refractive index n of the prism material?

Answer: A. n = sin((A + δm)/2) / sin(A/2) — At minimum deviation, the prism is in the symmetric position and the standard relation is n = sin((A + δm)/2) / sin(A/2). This formula is frequently used in prism problems.

PHYSICS · CLASS 12 INTERMEDIATE 2 YEAR · Telangana State Board

Practice Chapter 2: Ray Optics and Optical Instruments with a free chapter-wise online MCQ test for Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR PHYSICS. This chapter covers: This chapter details reflection total internal reflection refraction at spherical surfaces lens formulas magnification prism dispersion and optical instruments including microscope.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 2: Ray Optics and Optical Instruments — Important Questions & Answers (FAQ)

Frequently asked questions from Telangana State Board CLASS 12 INTERMEDIATE 2 YEAR PHYSICS — Chapter 2: Ray Optics and Optical Instruments, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the principal focus of a convex lens?

A. The point where parallel rays converge after refraction ✓
B. The center of the lens through which light passes undeviated
C. The point where all rays from the focus become parallel
D. The point where reflected rays appear to diverge

Answer: A. The point where parallel rays converge after refraction
A convex lens converges parallel rays to a point called the principal focus. This is a basic defining property of a converging lens.

Which of the following is the SI unit of the power of a lens?

A. dioptre ✓
B. metre
C. joule
D. newton

Answer: A. dioptre
The power of a lens is measured in dioptres (D), where 1 D = 1 m^-1. It indicates the converging or diverging ability of the lens.

A ray of light passes from glass to air. Which of the following is true when the angle of incidence is greater than the critical angle?

A. The ray bends away from the normal and emerges
B. The ray bends towards the normal and emerges
C. The ray is totally internally reflected ✓
D. The ray is absorbed completely

Answer: C. The ray is totally internally reflected
When light travels from a denser to a rarer medium and the incidence angle exceeds the critical angle, total internal reflection takes place. No refraction occurs into the rarer medium.

Which of the following statements about a concave mirror is NOT correct?

A. It can form a real image
B. It can form a virtual image
C. It always forms an erect image ✓
D. It can magnify the image

Answer: C. It always forms an erect image
A concave mirror can form both real and virtual images depending on object position, and the image may be erect or inverted. Therefore, it does not always form an erect image.

A prism of angle A produces minimum deviation δm for a ray. Which relation is correct for refractive index n of the prism material?

A. n = sin((A + δm)/2) / sin(A/2) ✓
B. n = sin(A/2) / sin((A + δm)/2)
C. n = (A + δm)/A
D. n = sin δm / sin A

Answer: A. n = sin((A + δm)/2) / sin(A/2)
At minimum deviation, the prism is in the symmetric position and the standard relation is n = sin((A + δm)/2) / sin(A/2). This formula is frequently used in prism problems.