Light – Reflection and Spherical Mirrors Quiz - ICSE Class 9 Physics
Free practice quiz: Light – Reflection and Spherical Mirrors (ICSE Class 9 Physics). 39 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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An object is placed at 2F from a convex mirror. What is the nature and position of the image formed?
- Virtual, erect, diminished, at F/2
- Virtual, erect, diminished, between P and F
- Real, inverted, diminished, at F/2
- Virtual, erect, magnified, at 2F
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Answer: B. Virtual, erect, diminished, between P and F
For a convex mirror, the image is always virtual, erect, and diminished, regardless of the object's position. When the object is placed at 2F (which is beyond the center of curvature in a convex mirror's context, or simply a significant distance away), the image forms between the pole (P) and the focal point (F), and it is diminished.
For a convex mirror, the image is always:
- real and inverted
- virtual and inverted
- virtual and erect
- real and erect
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Answer: C. virtual and erect
Convex mirrors are diverging mirrors. They always form images that are virtual (behind the mirror), erect (upright), and diminished (smaller than the object), irrespective of the object's position.
Which type of spherical mirror is used as a rearview mirror in vehicles?
- Concave mirror
- Convex mirror
- Plane mirror
- Parabolic mirror
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Answer: B. Convex mirror
Convex mirrors are used as rearview mirrors because they provide a wider field of view. They always form virtual, erect, and diminished images, allowing the driver to see a larger area of the road behind the vehicle.
Which of the following statements correctly describes the image formed by a concave mirror when the object is placed between the center of curvature and infinity?
- Real, inverted, and magnified
- Virtual, erect, and magnified
- Real, inverted, and diminished
- Virtual, erect, and diminished
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Answer: C. Real, inverted, and diminished
When an object is placed between the center of curvature (2F) and infinity for a concave mirror, the image formed is real, inverted, and diminished. The image is located between the principal focus (F) and the center of curvature (2F).
A ray of light incident normally on a spherical mirror is:
- reflected back along the same path
- refracted at 90 degrees
- reflected parallel to the principal axis
- reflected at the same angle of incidence with the principal axis
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Answer: A. reflected back along the same path
When a ray of light is incident normally on a spherical mirror (i.e., along the radius of curvature or along the principal axis), it strikes the mirror at a 90-degree angle to the tangent at that point. The normal at the point of incidence is the line joining the center of curvature to that point. Therefore, the angle of incidence is 0 degrees with the normal, and by the law of reflection, the angle of reflection is also 0 degrees, meaning the ray retraces its path.