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Questions and Answers
What enables us to see objects during the day?
What enables us to see objects during the day?
In optical phenomena, what does a small source of light casting a sharp shadow indicate?
In optical phenomena, what does a small source of light casting a sharp shadow indicate?
What optical phenomenon involves light bending around a very small object?
What optical phenomenon involves light bending around a very small object?
What is the effect when an opaque object on the path of light becomes very small?
What is the effect when an opaque object on the path of light becomes very small?
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How do we see through a transparent medium?
How do we see through a transparent medium?
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What makes things visible when we light up a dark room?
What makes things visible when we light up a dark room?
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What happens to a ray parallel to the principal axis after reflection in a concave mirror?
What happens to a ray parallel to the principal axis after reflection in a concave mirror?
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When a ray passes through the principal focus of a convex mirror, what is its behavior after reflection?
When a ray passes through the principal focus of a convex mirror, what is its behavior after reflection?
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What happens to a ray passing through the centre of curvature of a concave mirror after reflection?
What happens to a ray passing through the centre of curvature of a concave mirror after reflection?
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In what way does a ray incident obliquely towards the pole of a convex mirror behave after reflection?
In what way does a ray incident obliquely towards the pole of a convex mirror behave after reflection?
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What is true about a ray directed towards the centre of curvature of a convex mirror?
What is true about a ray directed towards the centre of curvature of a convex mirror?
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When a ray is parallel to the principal axis in a convex mirror, what is its behavior after reflection?
When a ray is parallel to the principal axis in a convex mirror, what is its behavior after reflection?
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What is the angle of reflection equal to, according to the laws of reflection of light?
What is the angle of reflection equal to, according to the laws of reflection of light?
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What lies in the same plane according to the laws of reflection of light?
What lies in the same plane according to the laws of reflection of light?
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Which type of surface reflects most of the light falling on it?
Which type of surface reflects most of the light falling on it?
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What do we call an image formed by a plane mirror?
What do we call an image formed by a plane mirror?
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In the context of light reflection, what does a virtual image mean?
In the context of light reflection, what does a virtual image mean?
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How does a real image formed by a mirror differ from a virtual image?
How does a real image formed by a mirror differ from a virtual image?
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Study Notes
Nature of Light
- At the beginning of the 20th century, the wave theory of light was found to be inadequate in explaining the interaction of light with matter.
- Light exhibits both wave-like and particle-like properties.
- The modern quantum theory of light reconciles these properties.
Reflection of Light
- A highly polished surface, such as a mirror, reflects most of the light falling on it.
- The laws of reflection of light state that:
- The angle of incidence is equal to the angle of reflection.
- The incident ray, the normal to the mirror at the point of incidence, and the reflected ray all lie in the same plane.
- These laws are applicable to all types of reflecting surfaces, including spherical surfaces.
Mirrors and Reflection
- A small source of light casts a sharp shadow of an opaque object, indicating that light travels in straight lines.
- When an opaque object on the path of light becomes very small, light bends around it, exhibiting diffraction.
- In optics, light is thought of as a wave to explain phenomena such as diffraction.
Rays and Mirrors
- A ray parallel to the principal axis, after reflection, will pass through the principal focus in case of a concave mirror or appear to diverge from the principal focus in case of a convex mirror.
- A ray passing through the principal focus of a concave mirror or a ray directed towards the principal focus of a convex mirror, after reflection, will emerge parallel to the principal axis.
- A ray passing through the centre of curvature of a concave mirror or directed in the direction of the centre of curvature of a convex mirror, after reflection, is reflected back along the same path.
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Description
Explore the modern quantum theory of light, which reconciles the particle properties of light with its wave nature. Learn about how light is neither exclusively a wave nor a particle, but a unique entity with dual characteristics.
