The diagram below illustrates this using lines of sight for Al. What is the angle of refraction $\theta_r$, with respect to a perpendicular line to the second mirror, as shown? When sighting along such a line, light from the object reflects off the mirror according to the law of reflection and travels to the person's eye. Answer: See the above section about properties of plane mirror for the correct answer which is (d). Initially, we have an object in front of a plane mirror. The lowest point on the image that the eye can see is that point in line with the line of sight that intersects the very bottom of the mirror. Continuous lines from the mirror to eye indicate the reflected rays. For simplicity sake, we will suppose that Suzie is viewing the image with her left eye closed. Pick one extreme on the image of the object and draw the reflected ray that will travel to the eye as it sights at this point. Tutorials and Solved Problems on Plane Mirrors, Spherical mirrors, and Lenses are presented here. Initially, we have an object in front of a plane mirror. 1. Second, we draw light rays from the image to the eye. Another reason why the image is virtual in plane mirrors is that image is formed on the opposite side of the mirror where the object does not exist. One of them incident normally on the mirror and the other strikes the mirror at an angle of incidence $\theta$ and is reflected at an equal angle with the normal (due to the law of reflection: all rays striking any surface (polished or rough) are reflected at an angle from the normal equal to the incident angle). Recall from high school geometry that when two triangles are similar then there is a proportionality between their corresponding sides. The image size $h_i$ is always equal to the object size $h_O$ i.e. Plane mirror- Definition, Properties and Ray Diagram Mirrors are defined as one side-polished surface that can reflect the light rays. \begin{align*} m \equiv \frac{\text{image height}}{\text{object height}}&=\frac{h_i}{h_O}\\  On the diagram, rays (lines with arrows) are drawn for the incident ray and the reflected ray. Because of that, a virtual image cannot be projected on a screen. Useful for GCSE Physics. The four steps of the process for drawing a ray diagram are listed, described and illustrated below. Whom can Ed see? As shown in the figure all light rays emanating from a point source $P$ are reflected from a plane mirror so that the extensions of the reflected rays backward appear to come (or diverge) from point $P'$ (The rays do not actually pass through the mirror since the most mirrors in the market are opaque). Made with | 2010 - 2020 | Mini Physics |. Reflection and the Ray Model of Light - Lesson 2 - Image Formation in Plane Mirrors. However in this case, there are no other students between Ed and Fred; thus, Ed and Fred are the only students whom Al can see? © 1996-2020 The Physics Classroom, All rights reserved. The rightward-most student who Al can see is the student whose image is to the left of the line of sight that intersects the right edge of the mirror. by Which of the following statements are true for an image formed by a plane mirror? In addition, there are hundreds of problems with detailed solutions on various physics topics. Again using the law of reflection, the reflected ray from the latter mirror is $\theta_r=70{}^\circ$. \begin{align*}\frac {OP}{OP'}=\frac {OB}{OB} =1\\ \frac {PB}{P'B}=\frac {OB}{OB} =1 \end{align*} This would be Fred. For simplicity sake, we will suppose that Suzie is viewing the image with her left eye closed. Lines joining the object to the positions of the reflected rays on the mirror represent the incident rays. Therefore, for plane mirrors, object and diverging light rays are on the same side of the mirror so object distance is positive ($p>0$) but the image and outgoing (reflected) rays are on the opposite side of the mirror so image distance is negative i.e. The task begins by locating the images of the given students. There are situations where reflected light rays actually meet each other such as concave mirror. (d) Image has always lateral magnification of one. Perhaps you will want to try to determine whom Bo, Cy, Di, Ed, and Fred can see? By principle, in optics, image is formed where reflected light rays actually intersect each other or where they appear to come from. Third, we join the light rays from the mirror to the object. Post was not sent - check your email addresses! Administrator of Mini Physics. A plane mirror is a mirror that has a flat reflecting surface without any inward or outward curve. $q<0$ and proves that $m>0$.


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