Reflection of Light
ICSE · Class 9 · Physics
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What happens when light strikes a surface and returns to the same medium?
According to the first law of reflection, the angle of incidence is:
What type of reflection occurs from a smooth polished surface?
How many images are formed when an object is placed between two parallel plane mirrors?
Sample Questions
Which of the following are characteristics of the image formed by a plane mirror?
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Virtual, Erect, Same size as object, Laterally inverted
A plane mirror forms an image that is virtual (cannot be obtained on screen), erect (upright), same size as the object, and laterally inverted (left appears right). The image is not real as it cannot be projected on a screen.
The focal length of a spherical mirror is related to its radius of curvature by:
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f = R/2
For any spherical mirror (concave or convex), the focal length is half of the radius of curvature, i.e., f = R/2. This is a fundamental relationship in spherical mirror geometry.
Which type of spherical mirror always forms a virtual, erect, and diminished image?
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Convex mirror
A convex mirror always forms a virtual, erect, and diminished image regardless of the object's position. Concave mirrors can form different types of images depending on object position.
When an object is placed at the focus of a concave mirror, where is the image formed?
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At infinity
When an object is placed at the focus of a concave mirror, the reflected rays become parallel and the image is formed at infinity. This principle is used in torches and headlights.
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