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Chapter Analysis
Beginner19 pages • EnglishQuick Summary
This chapter on 'Light' explores the fundamental properties of light, including how it travels in straight lines and reflects off surfaces. It delves into the concepts of mirrors and lenses, explaining the formation of real and virtual images. The chapter also discusses the dispersion of light and the composition of white light, giving rise to rainbows. Through activities, it teaches about convex and concave mirrors and lenses, providing insights into their practical uses.
Key Topics
- •Reflection of light
- •Refraction through lenses
- •Real and virtual images
- •Convex and concave mirrors
- •Dispersion of light
- •White light and colors
- •Images formed by lenses
- •Usage of mirrors
Learning Objectives
- ✓Understand that light travels in straight lines.
- ✓Use the concepts of reflection and refraction to explain image formation.
- ✓Differentiate between real and virtual images.
- ✓Identify practical applications of concave and convex mirrors.
- ✓Explain the dispersion of light and the formation of a rainbow.
- ✓Recognize how lenses can be used as magnifying glasses.
Questions in Chapter
Fill in the blanks: An image that cannot be obtained on a screen is called ____________.
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Mark ‘T’ if the statement is true and ‘F’ if it is false: We can obtain an enlarged and erect image by a convex mirror. (T/F)
Answer: False
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State the characteristics of the image formed by a plane mirror.
Answer: The image formed by a plane mirror is erect, virtual and is of the same size as the object. It is at the same distance behind the mirror as the object is in front of it.
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What is a virtual image? Give one situation where a virtual image is formed.
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State two differences between a convex and a concave lens.
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Give one use each of a concave and a convex mirror.
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Additional Practice Questions
Explain how light travels.
easyAnswer: Light travels in straight lines. This can be observed when a beam of sunlight enters a room through a narrow opening or hole.
How can you demonstrate that white light is composed of seven colors?
mediumAnswer: You can use a glass prism to split a narrow beam of sunlight into a spectrum, displaying the seven colors: red, orange, yellow, green, blue, indigo, and violet.
Describe how a convex lens forms an image.
mediumAnswer: A convex lens can focus light to produce real and inverted images when the object is at various distances from the lens. When the object is near, it forms a magnified and virtual image.
What are the uses of concave and convex mirrors?
easyAnswer: Concave mirrors are used in places like optical instruments and flashlights because they focus light. Convex mirrors are used for rearview mirrors in vehicles because they give a wider field of view.
Discuss the differences in images formed by plane and spherical mirrors.
hardAnswer: Plane mirrors form images that are the same size as the object, erect and virtual. Spherical mirrors, like concave and convex mirrors, can form real or virtual images that may differ in size based on object distance.
NCERT Exemplar
AvailablePractice with NCERT Exemplar problems and solutions for this chapter. Exemplar problems are designed to help you master the concepts with advanced-level questions.
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