How does this structure help them? A concave mirror produces a real image twice the size of the object when placed at a distance of 22.5 cm from it. Define light. Two mirrors A and B are placed at right angles to each other as shown in Fig.16.4. | If both object and mirror moves away from each other with a speed of 20 m/s, then find (a) The speed of the image (b) Speed of the image with respect to object (c) Speed of the image with respect to mirror. Explain the process which enables us to perceive motion in a cartoon film. Videos Which of the following statements is correct regarding rods and cones in the human eye? Look at Fig.16.7. (iii) The image of an object placed in front of a spherical mirror is virtual. Can the image of the child in it be obtained on a screen? Find the position, nature and size of the final image for reflections first at concave mirror and then at convex mirror. Show that the length of a plane mirror in which a person can see his fall image is half the height of the person. Here you can get Class 8 Important Questions Science based on NCERT Text book for Class VIII. Class 8 Science light Very Short Answer Questions. If a light ray is incident on the first mirror parallel to the second mirror and reflected from the second parallel to the first mirror, then find the value of \[\theta \]. The distance between the object and its image formed by a plane mirror appears to be 24 cm. A man 180 cm high stands in front of a plane mirror. You also get idea about the type of questions and method to answer in your Class 8th examination. (iii) The image of an object placed in front of a spherical mirror is virtual. How many times is a ray of light reflected by two plane mirrors placed parallel and facing each other? | | An object is placed between the mirrors at a distance of 4 cm from one of them, say\[{{M}_{1}}\]. | | Boojho planned an activity to observe an object A through pipes as shown in Fig. Privacy Policy question_answer5) A man 180 cm high stands in front of a plane mirror. A convex lens of focal length 15 cm is placed in , front of a convex mirror coaxially at a distance of 5cm from the pole of the mirror. Very Short Answer Questions. Draw Fig.16.6 showing the position of the plane mirror. Class 8 Science Home Page. Q2. Purchase Courses Question 2. | (ii) We have a mirror. If the mirror moves towards the object by a distance of 20 cm, then find the displacement of the image. The pencil of light coming out of the hole falls on a mirror. As the object distance is decreased infinity to focal length, l the size of the inverted image increases. question_answer6) A concave mirror produces a real image twice the size of the object when placed at a distance of 22.5 cm from it. Ans. There is a mistake in each of the following ray diagrams given as Fig. We can see a non-luminous object when light: (a) emitted by the object falls on the eye. 16.10 shows the word REST written in two ways in front of a mirror. Which part of the eye gets affected if someone is suffering from cataract? Articles Also label the angle of incidence and angle of reflection on it. question_answer7) Two plane mirrors are inclined to each other at an angle of \[{{70}^{o}}\]. question_answer10) Two plane mirrors are placed parallel to each other. Current Affairs Science Class 8 Important Questions are very helpful to score high marks in board exams. Questions Bank The lesson covers the complete explanation of class 8 Chapter 16 Light. question_answer14) A convex and a concave mirror of radii 10 cm each are placed facing each other and 15 cm apart. What is power of accommodation? Question 1: What is light? Question from very important topics are covered by NCERT Exemplar Class 8. It helps in the sense of vision. An object is placed at a certain distance in front of a plane mirror. Light Class 8 Extra Questions Higher Order Thinking Skills. What is the speed of the image? What is the value of \[\theta \] ? A needle 1.5 cm is placed at a distance of 20 cm from a concave mirror of focal length 15 cm. At what distance from the mirror should the object be placed so that the real image becomes three times the size of the object? | Dispersion of light. question_answer11) A plane mirror is moved away from a stationary object with a speed of 20 cm/s. (d) gets completely absorbed by the object. Give an example. Refund Policy, You need to login to perform this action.You will be redirected in The cardboard is illuminated by light from a bulb. At what angle will the ray finally emerge? Fig. What is the value of \[\theta \] ? Ans. Franchise When an object is placed at a distance of 20 cm from the lens, it is found that the image coincided with the object. Name the part of the eye which gives colour to the eyes. | question_answer13) (i) We have a spherical mirror. About Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 8. Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 8.. Answer: Light is a form of energy. Is the spherical mirror concave or convex? A ray of light parallel to Mirror 1 strikes the Mirror 2. At what distance from the mirror should a screen be placed in order to receive a sharp image. Previous Next. NCERT Exemplar Class 8 Science is very important resource for students preparing for VIII Board Examination. To get fastest exam alerts and government job alerts in India, join our Telegram channel. (c) What must be the angle with respect to the incident light at which he should place the mirrors? An object is placed mid way between them. Why Studyadda? What are the applications of a kaleidoscope? What is the speed of the image? A convex and a concave mirror of radii 10 cm each are placed facing each other and 15 cm apart. Ncert Solutions Science Important Questions Class 8 are given below. What is the value of angle of incidence? An object is placed at a distance of 20 cm in front of a plane mirror. A ray is incident on one mirror at an angle \[\theta \]. | The distance between the mirrors is 10 cm. If a light ray is incident on the first mirror parallel to the second mirror and reflected from the second parallel to the first mirror, then find the value of \[\theta \]. question_answer1) An object is placed at a distance of 20 cm in front of a plane mirror. | As the object distance is decreased infinity to focal length, l the size of the inverted image increases. A ray of light parallel to Mirror 1 strikes the Mirror 2. question_answer12) Show that the length of a plane mirror in which a person can see his fall image is half the height of the person. If the position of the object is changed, the 2 image still remains virtual and erect. What could be the reason for it? What kind of lens is there in our eyes? | | How is the phenomenon of reflection used in making a kaleidoscope? What is the distance between the mirror and the object? | February 19, 2019 by SuccessCDs Team in CBSE Class 8 Science Lessons Explanation, Notes, NCERT Question Answers. 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