notes of light Chapter 15 science class 7th CBSE
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Answer:
In this world, we usually see a variety of objects.
Sometimes, we are unable to see anything in a
dark room but on lighting up the room, we are
able to see the things in the room. Since, it is an
obvious question arising that what makes thing
visible.
So, it's answer is light.
Light is a form of energy which enables us to see objects from where it comes or reflected. We can detect light with our eyes.
Light travelling along a straight line.
By seeing the phenomenon around us like a
beam of sunlight enters a room through a narrow
opening or a hole and beam of light coming out
from the head lamps of cars, Scooters, engines, torch, etc...
From the above examples, we can conclude the light that travels along a straight line.
Reflection of light.
There are some certain situations in which a
mirror or shiny surfaces like stainless steel plate,
shinning spoon act as mirror, can change the
direction of light that falls on it. So, this is the
process of change in direction of light.
By a mirror is called reflection light.
The surface of water can also act as a mirror and
can also change the path of light and that's why
we see the reflection of tress or building in the
water.
Hope it helps you and Thank you.