notes of light chapter in science
Answers
then. . u see that video. and understand. . and also make notes
- Here is yr answer :
Question: What do you means by lateral inversion?
Answer: Lateral inversion means left looks like right and right looks like left in a mirror.
Question: What is a spectrum?
Answer: Spectrum is the band of colours seen when the white light passes through the prism and splits into seven colours.
Question: What is Reflection?
Answer: The bouncing off of light from a surface known as reflected light.
Question: Name the mirror that forms only diminished image.
Answer: Concave mirror.
Question: What is bouncing off light from the surface called?
Answer: Bouncing off light from the surface is called reflection of light.
Question: A lens produces a magnified virtual image of an object. Name the lens.
Answer: Convex lens.
Question: What is the image that can be projected on a screen?
Answer: Real image can be projected on a screen.
Question: What is the splitting of light into its component colour called?
Answer: Dispersion of light
Question: What do you mean by rectilinear propagation of light?
Answer: Rectilinear propagation of light means that beam of a light always travels in a straight line.
Question: How can we change the direction of the light?
Answer: We can change the direction of the light by the phenomenon called reflection.
Question: What do you mean by reflection of light?
Answer: When a ray of light falls on the surface of any mirror, it bounces back in the same medium. This is called reflection of light.
Question: What is a mirror?
Answer: Any polished or shining surface is called a mirror.
Question: What do you mean by a real image?
Answer: Image which cannot be obtained on a screen is called a real image.
Question: What do you mean by a virtual image?
Answer: Image which cannot be obtained on a screen called virtual image.
Question: What is a convex mirror?
Answer: A mirror which reflects the light from its inner polished side.
Question: What is a concave mirror?
Answer: A mirror, which reflects light from its outer polished surface.
Question: How will you identify a concave lens by touching it?
Answer: A concave lens is thinner at the center and thicker at the edges.
Question: What does act as prism in the formation of a rainbow?
Answer: Tiny raindrops suspended in atmosphere act as prisms in the formation of a rainbow.
Question: What is the difference between a real image and a virtual image? Give one example of each type of image.
Answer:
Real image:The image which can be obtained on a screen is called a real image. In a cinema hall, we see the images of actors and actresses on the screen. So, the images formed on a cinema screen are real images.
Virtual image: The images which cannot be obtained on a screen is called a virtual image. A virtual image can be seen only by looking into a mirror or a lens. The image of our face formed by a plane mirror cannot be obtained on a screen, it can be seen only by looking into the mirror. So, the image of our face in a plane mirror is a virtual image.
Question: What is the principle axis of a concave mirror?
Answer: A straight line passing through the two centers of curvature of the lens is called the principal axis of the lens.
Question: What is principal focus of a convex lens?
Answer: A parallel beam of light passing through a convex lens converges at a single point. This point is called the principal focus (F) of the convex lens. The distance between the principal focus and the optical centre of the convex lens is called the focal length of the lens.
Question: Mention the characteristics of an image formed by a plane mirror.
Answer: Characteristics of an image formed by a plane mirror are:
The image formed by a plane mirror is always virtual and erect.
The image undergoes lateral inversion.
The size of the image formed by a plane mirror is the same as that of the object.
The distance of the object from the mirror is equal to the distance of the image formed by the mirror (that is, image distance = object distance)
