Q1. When light rays parallel to the principal axis fall on a concave mirror, where do they converge after reflection?
a) At the focal point
b) At the center of curvature
c) At the pole
d) They do not converge
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Correct Answer: a) At the focal point
Explanation: Light rays parallel to the principal axis converge at the focal point after reflection from a concave mirror.
Q2. What type of image is formed when an object is placed between the focal point and the pole of a concave mirror?
a) Real and inverted
b) Virtual and erect
c) Real and erect
d) Virtual and inverted
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Correct Answer: d) Virtual and inverted
Explanation: For an object placed between the focal point and the pole of a concave mirror, a virtual and inverted image is formed behind the mirror.
Q3. Which of the following statements is true for the image formed by a convex mirror?
a) Always real and inverted
b) Always virtual and erect
c) Always virtual and inverted
d) Always real and erect
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Correct Answer: b) Always virtual and erect
Explanation: Images formed by convex mirrors are always virtual, erect, and diminished, regardless of the object’s position.
Q4. What is the focal length of a concave mirror if its radius of curvature is 20 cm?
a) 20 cm
b) 10 cm
c) 40 cm
d) 30 cm
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Correct Answer: b) 10 cm
Explanation: The focal length (f) of a concave mirror is half its radius of curvature (R), so if R = 20 cm, then f = 10 cm.
Q5. In which type of mirror is the focus point located behind the mirror?
a) Concave mirror
b) Convex mirror
c) Plane mirror
d) Spherical mirror
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Correct Answer: b) Convex mirror
Explanation: In a convex mirror, the focus point is located behind the mirror, and the reflected rays diverge as if they originated from this point.
Q6. What is the relationship between the focal length and the radius of curvature of a concave mirror?
a) Focal length = Radius of curvature
b) Focal length = 2 * Radius of curvature
c) Focal length = 0.5 * Radius of curvature
d) Focal length = 1.5 * Radius of curvature
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Correct Answer: c) Focal length = 0.5 * Radius of curvature
Explanation: The focal length (f) of a concave mirror is half its radius of curvature (R), so f = 0.5 * R.
Q7. What is the nature of the image formed by a concave mirror when the object is located beyond the center of curvature?
a) Real and inverted
b) Virtual and erect
c) Real and erect
d) Virtual and inverted
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Correct Answer: c) Real and erect
Explanation: When the object is located beyond the center of curvature of a concave mirror, a real and inverted image is formed between the focus and the center of curvature.
Q8. Which of the following is true regarding the magnification produced by a spherical mirror?
a) Always greater than 1
b) Always less than 1
c) Can be greater than or less than 1
d) Always equal to 1
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Correct Answer: c) Can be greater than or less than 1
Explanation: The magnification produced by a spherical mirror can be greater than or less than 1, depending on the position of the object relative to the mirror.
Q9. What is the magnification produced by a plane mirror?
a) -1
b) 0
c) +1
d) Infinity
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Correct Answer: c) +1
Explanation: The magnification produced by a plane mirror is always +1, indicating that the image is of the same size as the object and upright.
Q10. What is the name given to the point on the principal axis where all incident rays parallel to the axis converge or appear to diverge from after reflection by a concave mirror?
a) Pole
b) Focus
c) Center of curvature
d) Vertex
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Correct Answer: b) Focus
Explanation: The point on the principal axis where all incident rays parallel to the axis converge or appear to diverge from after reflection by a concave mirror is called the focus.