Light - Class 8 - Science
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Back Questions - Light | NCERT | Science | Class 8
Suppose you are in a dark room. Can you see objects in the room? Can you see objects outside the room? Explain.
In a dark room, you cannot see objects inside the room because for us to see any object, light from that object must enter our eyes. In a dark room, there is no light for reflection off the objects and no reflected light to enter our eyes. However, you can see objects outside the room if there's light outside. This is because light from the objects outside can enter the room and subsequently our eyes, making it possible to see those objects.
Differentiate between regular and diffused reflection. Does diffuse reflection mean the failure of the laws of reflection?
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Sign up nowMention against each of the following whether regular or diffused reflection will take place when a beam of light strikes. Justify your answer in each case.
(a) Polished wooden table
(b) Chalk powder
(c) Cardboard surface
(d) Marble floor with water spread over it
(e) Mirror
(f) Piece of paper
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Sign up nowState the laws of reflection.
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Sign up nowDescribe an activity to show that the incident ray, the reflected ray and the normal at the point of incidence lie in the same plane.
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Sign up nowFill in the blanks in the following.
(a) A person 1 m in front of a plane mirror seems to be _______________ m away from his image.
(b) If you touch your ____________ ear with right hand in front of a plane mirror it will be seen in the mirror that your right ear is touched with ____________.
(c) The size of the pupil becomes ____________ when you see in dim light.
(d) Night birds have ____________ cones than rods in their eyes.
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Sign up nowAngle of incidence is equal to the angle of reflection.
(a) Always
(b) Sometimes
(c) Under special conditions
(d) Never
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Sign up nowImage formed by a plane mirror is
(a) virtual, behind the mirror and enlarged.
(b) virtual, behind the mirror and of the same size as the object.
(c) real at the surface of the mirror and enlarged.
(d) real, behind the mirror and of the same size as the object.
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Sign up nowDescribe the construction of a kaleidoscope.
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Sign up nowDraw a labelled sketch of the human eye.
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Sign up nowExtra Questions - Light | NCERT | Science | Class 8
The relationship between the focal length $f$ and radius of curvature $R$ for a spherical mirror is:
A) $f = 2R$
B) $f = \frac{R}{2}$
C) $R = 2f$
D) $R = 4f$
The correct relationships between the focal length ($f$) and the radius of curvature ($R$) for a spherical mirror are:
B$$ f = \frac{R}{2} $$
C$$ R = 2f $$
In a spherical mirror, the radius of curvature is twice the focal length. This places the mirror’s focus at the midpoint of the radius:
$R = 2f$ enters that $R$ is twice $f$.
$f = \frac{R}{2}$ indicates that $f$ is half of $R$. Both statements highlight the fundamental property of a spherical mirror concerning its geometry.
Describe how lightning occurs.
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Sign up nowLong Questions - Light | NCERT | Science | Class 8
Describe in detail the process of how our eyes enable us to see, by including components such as iris, cornea, pupil, lens, retina, and the optic nerve.
The eye, a crucial sensory organ, facilitates sight by allowing light to enter via its transparent front part, the cornea. The light then passes through an opening in the muscular structure known as the iris, which is responsible for controlling the quantity of light entering the eye through the pupil. The eye's lens, located behind the pupil, is central-thick which aids in focusing incoming light onto the retina. Here, two types of nerve cells (rods for dim light and cones for bright light) sense the light and transmit its information to the brain with the help of the optic nerve. Therefore, the interaction of these components in our eyes enables us to perceive the world around us visually.
Explain the concept of reflection of light, focusing on the laws of reflection. What happens when light falls on a plane mirror, and how is the image formed?
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Sign up nowShort Questions - Light | NCERT | Science | Class 8
What is the importance of the iris in our eyes?
The iris in our eyes plays a crucial role in controlling the amount of light entering into the eye. It does this by adjusting the size of the pupil according to the available light conditions. The iris also gives distinctive color to our eyes.
Describe the laws of reflection.
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Sign up nowWhat is meant by the term 'lateral inversion'?
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Sign up nowHow does the reflection of light make the moon visible to us?
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