Light Class 7 Notes CBSE Science Chapter 15 (Free PDF Download)

• Light is a naturally occurring substance that enhances vision and makes objects visible. Light follows a straight path.

• A mirror can be made out of any polished or gleaming surface. 

• A true image is one that can be obtained on a computer screen. It's made up of light rays that pass through the screen.

• A virtual image is an image that cannot be obtained on a screen. It's made up of light rays that appear to travel right through the screen.

• A planar mirror produces an erect picture. It's a virtual object that's the same size as the real thing. The picture behind the mirror is the same size as the object in front of it.

The left side of an object appears on the right side of an image generated by a mirror, and the right side of the object appears on the left side of the picture. 

• A true and inverted image can be created via a concave mirror. The picture generated when the object is put very close to the mirror is virtual, erect, and enlarged.

• A convex mirror is one that curves outwards and has a convex reflecting surface. The image that is created is virtual, upright, and shrunk. A convex mirror creates an image that is upright, virtual, and smaller in size than the object.

• A concave lens is one that has a thinner centre than it has at the edges. It's a convergent lens. The resulting image is imaginary, erect, and shrunken.

• A convex lens can create both a true and a distorted image. The image generated when the object is put very close to the lens is virtual, erect, and enlarged. The convex lens is known as a magnifying glass when it is used to magnify objects.

• White light is made up of seven different colours.

• Properties of Light: 

1. Rectilinear Propagation of Light: The quality of light that allows it to move in a straight line in any direction. The direction in which light travels to form a ray.

2. Light Reflection: This is the phenomenon of light rebounding back after striking an object's surface. Smooth, gleaming surfaces reflect nearly all of the light.

3. Dispersion: The breaking of white light into its seven colours is referred to as dispersion. Violet, Indigo, Blue, Green, Yellow, Orange, and Red (VIBGYOR) hues make up white light.

CBSE Class 7 Science Chapter 15 Light Notes

Light: Class 7 Science Chapter 15 Revision Notes Summary

Light is energy. It does not require a medium to travel, unlike sound. It travels through the transparent medium and is blocked by the opaque ones. The path of the rays can also get reflected when they fall on a shiny surface. This chapter will give a proper explanation of the new concepts related to light and how it behaves in different conditions. To take a quick look into the revision notes of this chapter, continue reading this summary.

In Light Class 7 notes, the expert teachers have prepared a platform where the students will find an easy explanation of the new concepts along with proper illustrations. The experienced teachers know where the students find difficulty in understanding these advanced concepts and laws. To make it feasible for students of all merit levels, the teachers have chosen an approach understandable to all. These revision notes are well organized where every section of this chapter has been covered excellently.

Here, students will learn the kinds of mediums depending on the ray of light entering them. There are opaque objects, translucent, and transparent objects depending on the amount of light passing through them. On proceeding further in Light Class 7 notes, you will find reflection properly explained. Reflection is the phenomenon where light rays bounce back from a shiny reflecting surface. These rays follow a set of laws. We call it the laws of reflection. These laws are universal and are valid for all kinds of light reflection.

Check out the proper explanation of these two laws in NCERT Class 7 Science Chapter 15 notes so that you can understand the definition of the angle of incidence, normal, and angle of reflection properly. learn how images are formed and what kind of images are there. You will be astonished to find these concepts and how images form. The chapter will also provide real-life examples around us to explain these two definitions. These examples will be simplified by the revision notes so that you can remember them.

Proceeding further, you will learn about the range of visibility and lateral inversion in plane mirrors. Learn how reflection occurs in curved mirrors. This is an advanced conceptual section that Class 7 Science Ch 15 notes will properly explain. Many students face doubts and look for a better explanation. This is where all your doubts related to curved surface reflection and lateral inversion will be resolved. Find out how convex and concave mirrors reflect light rays incident on them.

Every concept is illustrated using proper images and descriptions, so that you will not face any problems in understanding these concepts explained in Science Class 7 Chapter 15. Here you will learn about the difference between the reflection of such mirrors, and how light rays bend when they pass through a transparent medium such as lenses and prisms. Build your concept using these Class 7 Science Chapter 15 notes from Vedantu and ace your exams.

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Conclusion

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