12 Questions
What is light and how does it help us perceive the world around us?
Light is electromagnetic radiation that causes the sensation of vision. It helps us see the wonders of nature and man-made objects in our surroundings.
Why do we need polished surfaces for reflecting light?
Polished surfaces absorb less light and reflect maximum light, creating clear images.
What is the scientific definition of a mirror?
A surface that reflects light and creates clear images is called a mirror.
What are the two main types of mirrors commonly used?
The two main types of mirrors are plane mirrors and spherical mirrors.
How are plane mirrors made?
Plane mirrors are made by coating the back surface of a flat and smooth glass piece with a thin, reflecting film of aluminium or silver.
Why is another coat of a substance like lead oxide given over the reflecting film on mirrors?
Another coat of a substance like lead oxide is given over the reflecting film to protect it and make that side opaque.
Explain how an image is formed by a point source in front of a mirror.
Reflected rays appear to be coming from a point behind the mirror, creating a virtual image.
What happens to light rays falling perpendicularly on a mirror?
They are reflected back in the perpendicular direction.
Describe what happens when incident rays from a point source get reflected by a plane mirror.
The reflected rays appear to meet at the image point behind the mirror.
Why are images formed by reflection in a mirror called 'virtual images'?
The reflected rays do not actually meet; they only appear to be coming from a point behind the mirror.
What happens when an extended source is placed in front of a mirror?
An extended image of the whole source is formed.
How does the perpendicular distance of the image from a mirror relate to the source distance?
The perpendicular distance of the image from the mirror is equal to the perpendicular distance of the source from the mirror.
Explore the significance of light in nature and how it enables us to perceive the world around us, from the beauty of sunrises and rainbows to the visibility of man-made objects. Understand the concept of light as electromagnetic radiation.
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