![]() The incident ray, the reflected ray and the normal at the point of incidence, lie in the same plane.įix a sheet of white paper on a drawing board and draw a line MM 1 as shown below. The angle of incidence i is equal to the angle of reflection r (i.e., ∠i = ∠r) The interchange of the left and right sides in the image of an object in a plane mirror is called lateral inversion.īelow diagram illustrates lateral inversion of an image: ![]() What is meant by lateral inversion of an image in a plane mirror? Explain it with the help of a ray diagram. The difference between a real and a virtual image are as follows - Real imageĪ real image is formed due to actual intersection of the reflected rays.Ī virtual image is formed when the reflected rays appear to meet when produced backwards.Ī real image can be obtained on a screen.Ī virtual image cannot be obtained on a screen.Ī real image is inverted with respect to the objectĪ virtual image image is erect with respect to the object.Įxample - The image of a distant object formed by a concave mirror.Įxample - The image of an object formed by a plane mirror or by a convex mirror. Question 5ĭifferentiate between a real and a virtual image. (b) The position of the image is situated at the same perpendicular distance behind the mirror as the object is in front of it. Image is of the same size as the object.(a) The characteristics of an image formed by a plane mirror are. (b) How is the position of the image related to the position of the object? (a) Write three characteristics of image formed by a plane mirror? The two surfaces of the plane mirror are shown below. The silvered surface is further coated with some opaque material so as to protect the silvering on it. This forms the front surface of the mirror and the other surface is silvered (i.e., silver mercury or some suitable material is deposited over it). ![]() One surface of the glass plate is polished to a high degree of smoothness. (a) Plane mirror - It is made from few mm thick glass plate. Exercise 7(A) - Short Answer Type Question 1 Thus, a ray of light incident normally on a mirror is reflected along the same path. What is the angle of incidence and angle of reflection ?įor a ray incident normally on a plane mirror, the angle of incidence is i = 0°, therefore the angle of reflection r = 0°. Question 7Ī light ray strikes a mirror and retraces its path. Which of the two will produce a stronger reflected beam ?īlack polished mica sheet will produce a stronger reflected beam as highly polished and silvered surfaces reflect almost the entire light falling on them. Light from a torch is reflected by a white sheet of paper and a black polished mica sheet. Sin i sin r \dfrac sin r sin i = 1Īccording to the laws of reflection angle of incidence = angle of reflection, hence sin i = sin r and we get the ratio as 1. It can be seen only from a particular direction. The reflected beam is also parallel and it is in a fixed direction. Reason - Regular reflection occurs when a beam of light falls on a smooth and polished surface, such as a plane mirror. Regular reflection occurs when a beam of light falls on a. Reason - The plane containing the incident ray and normal is called plane of incidence Question 3 The plane containing the incident ray and normal is called : Reason - The angle which the incidence ray makes with the normal at the point of incidence is called angle of incidence. ![]() at the point of incidence is called angle of incidence. Exercise 7(A) - Multiple Choice Type Question 1
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