(a) A man standing in front of a plane mirror finds his image to be at a distance of 6 metre from himself. Question 10. Ask your question. Answer: Laws of reflection— (i) The incident ray, normal and the reflected ray all lie in the same plane. (a) Angle of incidence = angle of reflection (b) The incident ray, the reflected ray and the normal lie in one plane (c) The image formed by a plane mirror is at a distance behind the mirror as the object is in front of it. Light PPT For Class 7 & 8 CBSE 1. State in words, how do you find the location of image of an object formed by a plane mirror. When an object blocks light, it casts a shadow. You are standing at a distance 2 metre from a plane mirror. They can repeat the lessons as many times as required. Answer: Objects are seen when light after striking them, returns in the same medium and reach our eyes. For example in the given figure ambulance is written opposite so as to be seen correctly in the mirror of the vehicle moving ahead. i.e. BNAT; Classes. Hold-the mirror in the mirror holder. (ii) The image is of the same size as that of the object. Since angle of incidence is’the angle between incident ray and normal. Describe an experiment to verify the laws of reflection of light. How would you expect it to appear when viewed in red light? True. Example : It means image formed behind the mirror is as far behind the mirror as object is in front of it. are artificial sources of light. ∠AOB = 60 + 60 = 120°. = Vhite (c) Red + Blue = ………… (d) Green + Red = ………… Answer: (a) Blue + Green = Cyan (b) Red + Blue + Green = White (e) Red + Blue = Magenta (d) Green + Red = Yellow. soon. Take two rays from the point O and show how the image of O is formed and seen by the eye. (f) The objects are seen around us due to irregular reflection of light. She slows down to 4.0 m/s. Question 4. (a) What is the distance of your image from the mirror ? Share this Video Lesson with your friends Support US to Provide FREE Education Subscribe to Us on YouTube ... Light Part 8 (Lateral Inversion) Class 7 VII . Can light travel in vacuum ? The angle AOB is 30°. The reason is that the rose absorbs the green light falling on it and reflect none. APlusTopper.com provides step by step solutions for Selina Concise ICSE Solutions for Class 7 Physics. Place a mirror XX’ on line KK’ such that polished side of mirror is along the line. It would appear black when seen in red light because it absorbs light of all the colours. Sample papers, board papers and exam tips. shows an incident ray AO and the normal ON on a plane mirror. (ii) The angle of incidence is equal to the angle of reflection. Question 7. Light Part 12 (Spherical Mirror Application) Class 7 VII . Apart from being the largest Class 7 community, EduRev has the largest solved Answer: Question 21. LATERAL INVERSION 3Light For Example You are the object and what you see in mirror is your image. This is due to lateral inversion -The phenomenon due to which the left side of an object appears to be right side of the object in its image in a reflecting medium (mirror ) and vice-versa is called lateral inversion. If the answer is not available please wait for a while and a community member will probably answer this We have received your request successfully. when the image of an object is erect but is inverted in the lateral side it is called lateral inversion ie the left side comes to the right and the right comes to the left. Answered What is lateral inversion of class 7 1 See answer The interchange of left and right between an object and its image is called  lateral inversion. How is a plane mirror made ? Join now. The sun and stars are natural sources of light. A rose appears red in white light. (g) The speed of light in vacuum is 3 × 108 ms-1. Question 17. View Lessons & Exercises for Real Image and Virtual Image →, View Lessons & Exercises for Laws of Reflection of Light →, View Lessons & Exercises for Spherical Mirror →. Answer: The location of image of a point object is as far behind the mirror as the object is in front of it. Light is a form of energy which helps us to see the objects. The following diagram shows a point object O placed in front of a plane mirror. Why is the word "ambulance" written backwards in ambulance car? Learnhive Lesson on Rectilinear Propagation of Light, Learnhive Lesson on Image formation by Convex Mirror, Learnhive Lesson on Image formation by Concave Mirror. Answer: Leaves appear green in white light because they reflect only the green light and absorb the light of all the other colours. Answer. Question 20. True. (iii) The image is laterally inverted. Learn about the formation of rainbow. Question 29. Smooth and polished surface like a mirror causes reflection and is called a regular reflection. NCERT Books. (a) The image formed by a plane mirror is real. For beginners, The charecteristic of the image formed by a plane mirror, that the left side of the object becomes the right side of the image, is know as lateral inversion. Question 33. Light always travels in a straight line in the form of rays. Example : It means image formed behind the mirror is as far behind the mirror as object is in front of it. (ii) The angle of incidence and angle of reflection are equal i.e. Academic Partner. ICSE SolutionsSelina ICSE SolutionsML Aggarwal Solutions. Question 6. (g) One surface of mirror is made opaque by silvering it followed by a thin coating of paint of lead oxide. …, onds later a second ball B is projected horizontally with same speed vo. Give a reason. Remove the mirror also. Enjoy interesting trivia related to spherical mirrors(concave and convex) and plane mirror, optics, sunlight. What is meant by lateral inversion of an image in a plane mirror ? In a lateral inversion - Get Solutions or Answers for all your questions here at BYJU'S. …, onless platform False. Label on it the incident ray, the reflected ray, the normal, the angle of incidence i and the angle of reflection r. Answer: AO is the incident ray OB is the reflected ray. Light sources are either natural or artificial. Answer: To make a plane mirror, a thin piece of glass is taken. Learnhive provides a large number of exercises to help them reduce these mistakes. Thus, the speed of light in vacuum (or air) is 3 x 108 m s’1 nearly. Understand the differences between mirrors and lenses. (i) The colour of an opaque object is the colour of light which it reflects. Draw the reflected ray. (i) A red rose is seen in green light. You can study other questions, MCQs, videos and tests for Class 7 on EduRev and even discuss your questions like Education Franchise × Contact Us. Why does a piece of paper appear white in sunlight ? L8 : Lateral Inversion - Light, Science, Class 8, L8 : Lateral Inversion - Light, Science, Class 7, RD Sharma Solutions for Class 7 Mathematics. Business Enquiry (North) 8356912811. Business Enquiry (South) 8104911739. Business Enquiry (West & East) 8788563422. Eg. Answer: A piece of paper appears white in sunlight because it reflects light of all the colours. Question 22. Lateral Inversion: In the mirror the right appears left and the left appears right. How will it appear in (i) green light, (ii) red light ? Light is a form of energy which helps us to see objects. What are the secondary colours ? True. Question 1. The image formed by a plane mirror cannot be obtained on a screen. Draw normal on the plane mirror at the point O and find : Answer: (i) the angle of incidence (ii) the angle of reflection, ON is normal on the plane mirror at point O ON is perpendicular on a plane mirror Angle of incidence ∠i = ∠AON and angle of reflection ∠r = ∠BON Since, ∠i – ∠r ∠AOB = 30° ⇒ ∠AON + ∠BON = 30° ⇒∠i + ∠i – 30° ⇒ 2 ∠i =30° ⇒ ∠i = 30 / 2 = 15° ∴Angle of incidence = ∠i = 15° and Angle of reflection ∠i = 15°.

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