Answer 5 A, H, I, M, O, T, U, V, W and X are the letters which form same image as the letter is. Can you see objects in the room? At one end of tube, touching these mirrors, a circular glass plate is fixed. Images are not formed by irregular reflection. Ans- On a table place a plane mirror perpendicular to the plane of the table. Image formed by a plane mirror is a virtual, behind the mirror and enlarged.
Q16: Boojho stands at A just on the side of a plane mirror as shown in Fig. This assembly, may be housed inside a a circular cardboard tube or tube of a thick chart paper. Suppose you are in a dark room. Fill in the blanks in the following. Apart from these, students also get to know about the human eye and its different parts like pupil, cornea, iris, retina, etc. Differentiate between regular and diffused reflection.
Can you see objects in the room? It will remain at the same position when Paheli moves from B to C. The laws of reflection have not failed because each ray obeys the law of reflection. What is the angle of incidence of a ray if the reflected ray is at an angle of 90° to the incident ray? However, he can see the objects placed at points P and Q, but cannot see the object placed at point R as shown in the given figure. Can you see objects outside the room? However, he can see the objects placed at points P and Q, but cannot see the object placed at point R as shown in the given figure. Answer: It is not possible to see in a dark room because of absence of light.
Answer 4: Refraction of light: The phenomenon of bending of light from its straight line path as it passes obliquely from one transparent medium to another is called refraction of light. It is harmful for eyes and can cause permanent damage. Q6 : Fill in the blanks in the following. Question 6: Fill in the blanks in the following. Answer 1 a An image that cannot be obtained on a screen is called virtual image. Position of image A remains fixed even if Paheli moves from B to C.
It is made up of a circular cardboard tube or tube of a thick chart paper in which rectangular mirror strips are joined together to form a prism. Ans- Because of the intensity of the laser light is very high, it is harmful to the human eyes. Visit main page or of the page. When the ray from this hole is incident on the mirror, it gets reflected in a certain direction. Question 13 Choose the correct option The rear view mirror of a car is a plane mirror.
The angle of incidence is 45 0. Answer: We can take care of our eyes by taking following measures: 1 Do not read in too bright or too dim light. Therefore, it will give a regular reflection. It can cause damage to the retina and lead to blindness. Answer : If we are in a dark room, then it is not possible for us to see objects in the room. Answer: The kaleidoscope is a simple toy that uses the idea of multiple images formed by the combination of plane mirrors.
Answer: Laser light is harmful for the human eyes, because its intensity is very high. Question 5 Find out the letters of English alphabet or any other language known to you in which the image formed in a plane mirror appears exactly like the letter itself. This happens because of the presence of irregular microscopic surfaces. Can you see objects outside the room? This end is now closed by a round glass plate allowing enough space for the coloured glass pieces to move fig d. Can you see objects outside the room? In diffused reflection, the reflected rays are not parallel to each other for parallel incident rays. Looking at the piece of paper on the table, we can easily show that the incident ray, the normal line and the reflected ray at the point of incidence lie in the same plane. Can you see objects outside the room? Does diffused reflection means the failure of the laws of reflection? Answer: The first law of reflection is used to obtain the path of reflected light.
Her teacher advised her not to do so. Download links are at the end of online solutions of each chapter. Similarly, incidental ray from R, will not be reflected to reach point A, hence will not be seen by Boojho. Answer: a Image of the object placed at A is formed behind the mirror. Keep the mirror vertically on the chart paper. Hence, it is advisable not to look at a laser beam directly. Describe an activity to show that the incident ray, the reflected ray and the normal at the point of incidence lie in the same plane.
According to the law of reflection, the angle of incidence is equal to the angle of reflection. Can you see objects in the room? Do not rub your eyes. Take another sheet and place it on the table in contact with the vertical mirror. Answer Place a plane mirror on the table. The distance of the image from the mirror is equal to the distance of A from the mirror.
Hence, diffused reflection will take place from a cardboard surface. Similarly, we can not see outside objects, sitting inside the darkroom, if there is no opening or passage for any incidental light from out side. Question 10: Draw a labeled sketch of the human eye. Answer: Infinite images will be formed because of multiple reflection between the parallel plane mirror. Download links are at the end of online solutions of each chapter.