Chapter Exam

Chapter 6: Ray Optics — Online MCQ Test

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 for a reflected ray at a smooth surface.

Q: The refractive index of a medium is defined as the ratio of speed of light in air to the speed of light in the medium. This quantity is called

Answer: A. Absolute refractive index — Absolute refractive index is defined with respect to vacuum or air, using the speed of light in the medium.

Q: A prism produces dispersion of white light because different colours of light have different

Answer: C. refractive indices in the prism material — Different colours travel with different speeds in the prism because the refractive index of the prism material depends on wavelength.

PHYSICS · CLASS 12th · Tamil Nadu State Board

Practice Chapter 6: Ray Optics with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 12th PHYSICS. This chapter covers: Focusing on geometric optics this chapter covers reflection refraction total internal reflection and spherical lens formulas. Students examine optical instruments including microsc.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 6: Ray Optics — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 12th PHYSICS — Chapter 6: Ray Optics, with answers and explanations. These are sample questions; the exam has its own separate question set.

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

A. Snell's law
B. Law of reflection ✓
C. Huygens' principle
D. Lens formula

Answer: B. Law of reflection
The law of reflection states that the angle of incidence equals the angle of reflection for a reflected ray at a smooth surface.

The refractive index of a medium is defined as the ratio of speed of light in air to the speed of light in the medium. This quantity is called

A. Absolute refractive index ✓
B. Relative refractive index
C. Critical angle
D. Dispersive power

Answer: A. Absolute refractive index
Absolute refractive index is defined with respect to vacuum or air, using the speed of light in the medium.

A ray of light passes from air into glass. Which statement is correct?

A. It bends away from the normal and its speed increases
B. It bends towards the normal and its speed decreases ✓
C. It bends away from the normal and its speed decreases
D. It does not change direction but its speed decreases

Answer: B. It bends towards the normal and its speed decreases
When light enters a denser medium like glass from air, it slows down and bends towards the normal.

A prism produces dispersion of white light because different colours of light have different

A. speeds in vacuum
B. amplitudes in air
C. refractive indices in the prism material ✓
D. frequencies in the prism material

Answer: C. refractive indices in the prism material
Different colours travel with different speeds in the prism because the refractive index of the prism material depends on wavelength.

In a compound microscope, which arrangement gives the final image at infinity?

A. Object at focus of objective and eyepiece adjusted so that intermediate image lies at its focus ✓
B. Object at centre of curvature of objective and eyepiece at optical centre
C. Object beyond 2f of objective and eyepiece at 2f
D. Object at principal focus of eyepiece only

Answer: A. Object at focus of objective and eyepiece adjusted so that intermediate image lies at its focus
For normal adjustment, the objective forms an intermediate image at the focal plane of the eyepiece, making the final image appear at infinity.