CBSE Class 7  >  Class 7 Notes  >  Science Olympiad   >  Infographics: Light

Infographics: Light

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L i g h t i s a f o r m o f e n e r g y t h a t a l l o w s y o u
t o s e e t h e t h i n g s a r o u n d y o u . 
TRANSPARENT
TRANSLUCENT
OPAQUE
n e a r l y a l l
l i g h t p a s s e s
t h r o u g h
s o m e l i g h t
p a s s e s
t h r o u g h
O p a q u e m a t e r i a l s d o n o t a l l o w l i g h t t o p a s s t h r o u g h t h e m .
B e c a u s e l i g h t c a n n o t b e n d a r o u n d t h i n g s , a s h a d o w i s
f o r m e d o n t h e o t h e r s i d e o f t h e o p a q u e m a t e r i a l s .
A l l l i g h t c o m e s f r o m a l u m i n o u s s o u r c e . A
l u m i n o u s s o u r c e c a n b e n a t u r a l o r a r t i f i c i a l .
l i g h t n i n g
Natural Sources
Artificial Sources
S u n
n o l i g h t
p a s s e s
t h r o u g h
W h e n a n o b j e c t c o m e s i n t h e w a y o f a b e a m o f l i g h t , t h e
a m o u n t o f l i g h t t h a t p a s s e s t h r o u g h c a n d i f f e r . O b j e c t s
c a n f a l l i n t o o n e o f t h r e e c a t e g o r i e s : 
SOURCES OF LIGHT
m e t e o r
LIGHT
LIGHT AND SHADOWS
c a n d l e f l a s h l i g h t l a m p
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FAQs on Infographics: Light

1. What is light and why is it important?
Ans. Light is a form of energy that travels in waves and is visible to the human eye. It is essential for various reasons, including enabling us to see our surroundings, allowing plants to perform photosynthesis, and influencing weather patterns. Without light, life on Earth would not be sustainable.
2. How does light travel?
Ans. Light travels in straight lines through a vacuum and can also pass through various mediums like air, water, and glass. The speed of light in a vacuum is approximately 299,792 kilometers per second, making it one of the fastest things in the universe.
3. What are the different types of light?
Ans. The different types of light include visible light, ultraviolet light, infrared light, X-rays, and gamma rays. Visible light is the only part of the electromagnetic spectrum that can be seen by the human eye, while the other types have various applications in science and technology.
4. What is reflection and how does it work?
Ans. Reflection is the bouncing back of light when it hits a surface. It occurs at the boundary between two different mediums, such as air and water. The angle at which the light strikes the surface (angle of incidence) equals the angle at which it reflects off the surface (angle of reflection).
5. What is refraction and why does it happen?
Ans. Refraction is the bending of light as it passes from one medium to another with a different density, such as from air to water. This bending occurs because light travels at different speeds in different materials, causing it to change direction when it enters a new medium.
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