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Chapters
2: Work and Energy
3: Current Electricity
4: Measurement of Matter
5: Acids, Bases and Salts
6: Classification of Plants
7: Energy Flow in an Ecosystem
8: Useful and Harmful Microbes
9: Environmental Management
10: Information Communication Technology (ICT)
▶ 11: Reflection of Light
12: Study of Sound
13: Carbon: An important element
14: Substances in Common Use
15: Life Processes in Living Organisms
16: Heredity and Variation
17: Introduction to Biotechnology
18: Observing Space: Telescopes
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Solutions for Chapter 11: Reflection of Light
Below listed, you can find solutions for Chapter 11 of Maharashtra State Board Balbharati for Science and Technology [English] 9 Standard Maharashtra State Board.
Balbharati solutions for Science and Technology [English] 9 Standard Maharashtra State Board 11 Reflection of Light Exercise [Page 127]
Answer the following questions.
Explain the difference between a plane mirror, a concave mirror, and a convex mirror with respect to the type and size of the images produced.
Why are concave mirrors used in solar devices?
Why are the mirrors fitted on the outside of cars convex?
Why does obtaining the image of the sun on paper with the help of a concave mirror burn the paper?
If a spherical mirror breaks, what type of mirrors are the individual pieces?
What sign conventions are used for reflection from a spherical mirror?
Draw ray diagrams for the cases of images obtained in concave mirrors as described in the table below.
| Images formed by concave mirrors | ||||
| No. | Position of the object | Position of the image | Nature of image | Size of the image |
| 1 | Between pole and focus | Behind the mirror | Erect, virtual | Magnified |
| 2 | At the focus | At infinity | Inverted, real | Very large |
| 3 | Between focus and centre of curvature | Beyond the centre of curvature | Inverted, real | Magnified |
| 4 | At the centre of curvature |
At the centre of curvature | Inverted, real | Same as the object |
| 5 | Object between infinity and Centre of curvature | Between the centre of curvature and focus | Inverted, real | Diminished |
| 6 | Object at infinity | At focus | Inverted, real | Diminished |
Which type of mirror is used in the following?
Periscope
Which type of mirror is used in the following?
Floodlights
Which type of mirror is used in the following?
Shaving mirror
Which type of mirror is used in the following?
Kaleidoscope
Which type of mirror is used in the following?
Street lights
Which type of mirror is used in the following?
Head lamps of a car
Solve the following examples.
An object of height 7 cm is kept at a distance of 25 cm in front of a concave mirror. The focal length of the mirror is 15 cm. At what distance from the mirror should a screen be kept so as to get a clear image? What will be the size and nature of the image?
A convex mirror has a focal length of 18 cm. The image of an object kept in front of the mirror is half the height of the object. What is the distance of the object from the mirror?
A 10 cm long stick is kept in front of a concave mirror having a focal length of 10 cm in such a way that the end of the stick closest to the pole is at a distance of 20 cm. What will be the length of the image?
Three mirrors are created from a single sphere. Which of the following - pole, centre of curvature, radius of curvature, principal axis - will be common to them and which will not be common?
Solutions for 11: Reflection of Light
Balbharati solutions for Science and Technology [English] 9 Standard Maharashtra State Board chapter 11 - Reflection of Light
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Concepts covered in Science and Technology [English] 9 Standard Maharashtra State Board chapter 11 Reflection of Light are Mirrors, Spherical Mirrors, Convex Mirror, Plane Mirror, Concave Mirror, Introduction to Light, Image Formation by Concave Mirror, Image Formation by Convex Mirror, Divergence and Convergence of Light, Sign Convention, Terms Related to Spherical Mirrors, Rules for Drawing Ray Diagrams, Mirror Equation/Formula, Linear Magnification (M) Due to Spherical Mirrors.
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