Chapter 1: Reflection of Light at Curved Surfaces — Online MCQ Test
PHYSICAL SCIENCES · CLASS 10th · Telangana State Board
Practice Chapter 1: Reflection of Light at Curved Surfaces with a free chapter-wise online MCQ test.
This chapter covers: This physics chapter explores how light behaves when reflecting off spherical mirrors (concave and convex). Students learn about key concepts such as focus center of curvature prin....
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Chapter 1: Reflection of Light at Curved Surfaces — Important Questions & Answers
What is the principal focus of a concave mirror?
- A. The point where all incident rays meet after reflection
- B. The point where rays parallel to the principal axis converge after reflection
- C. The center of the mirror surface
- D. The point midway between pole and center of curvature
Answer: B. The point where rays parallel to the principal axis converge after reflection
In a concave mirror, rays parallel to the principal axis converge at the principal focus after reflection.
In a concave mirror, rays parallel to the principal axis converge at the principal focus after reflection.
The center of the sphere of which a spherical mirror is a part is called the:
- A. Pole
- B. Principal focus
- C. Center of curvature
- D. Radius of curvature
Answer: C. Center of curvature
The center of curvature is the center of the imaginary sphere from which the mirror is cut.
The center of curvature is the center of the imaginary sphere from which the mirror is cut.
A ray parallel to the principal axis of a concave mirror after reflection:
- A. Passes through the center of curvature
- B. Passes through the principal focus
- C. Reflects back along the same path always
- D. Becomes parallel to the mirror surface
Answer: B. Passes through the principal focus
For a concave mirror, a ray parallel to the principal axis reflects through the principal focus.
For a concave mirror, a ray parallel to the principal axis reflects through the principal focus.
Which of the following is NOT a characteristic of the image formed by a convex mirror?
- A. Virtual
- B. Erect
- C. Diminished
- D. Real
Answer: D. Real
A convex mirror always forms a virtual image; it does not form a real image for any object position.
A convex mirror always forms a virtual image; it does not form a real image for any object position.
For a concave mirror, an image is formed at a distance 30 cm in front of the mirror when the object is placed at 60 cm in front of it. What is the focal length of the mirror?
- A. 10 cm
- B. 15 cm
- C. 20 cm
- D. 40 cm
Answer: B. 15 cm
Using the mirror formula with sign convention, u = -60 cm and v = -30 cm gives 1/f = -1/30 - 1/60 = -1/20, so f = -20 cm; the magnitude is 20 cm. However, among the given options, the correct board-style magnitude-based answer is 20 cm.
Using the mirror formula with sign convention, u = -60 cm and v = -30 cm gives 1/f = -1/30 - 1/60 = -1/20, so f = -20 cm; the magnitude is 20 cm. However, among the given options, the correct board-style magnitude-based answer is 20 cm.