What is the angle made by the reflected ray with the surface of the mirror? A ray of light is incident on a plane mirror at an angle of 35 о. It reaches a maximum height of 11.25m, calculateĭ. A body is projected from the ground at an angle of θ to the horizontal with a velocity of 30m/s. What will be the magnification of the image formed?ġ. A concave mirror of radius of curvature 20cm has a pin placed at 15cm from the pole. A concave mirror of radius of curvature 20cm produced an inverted image 3 times the size of an object placed on and perpendicular to the axis, calculate the position of the object and image.Ģ. The two positions of the object and its image are called conjugate foci since an object placed at any of these positions will produce an image at the other.ġ. Thus an object and its image can be interchanged. This is in line with the principle of reversibility of light. Rays passing the centre of curvature are reflected back along their path.Rays through the principal focus are reflected parallel to the principal axis.Rays parallel to the principal axis passes through the principal focus after reflection.Rays diagrams can be constructed for images formed by spherical mirror based on the following rules: RULES FOR CONSTRUCTING IMAGES FORMED BY SPHERICAL MIRROR The position and nature of images formed by curved mirrors can be investigated by placing a brightly lit object and a screen in front of the mirror so that the light from the object is incident on the mid-point of the mirror. The focal length, f, of a spherical mirror is half of its radius of curvature. Hence, the focus of a concave mirror is real since the converging rays can be seen on the screen but of convex mirror is virtual.
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