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ject —*], , , , FIGURE 14, , , , Concave mirror, , Convex mirror, , , , , , (A) Convex mirror, , (B) Concave mirror, FIGURE 16, , , , , , , , , , , , , , DINESH Super Simplified Physics. es, , 1. Incident ray of light parallel to the principal axis., , Any incident ray of light travelling parallel to ae principal axig, passes or appears to pass through the principal FOcts (F) on the, principal axis of a spherical mirror after reflection as shown jp, , figure 14 (Rule 1). j, , 2. Incident ray of light passing through the focus of a spherical mirror,, Incident ray of light passing through the principal focus of a spherical, mirror travels parallel to the principal axis after reflection as shown in, figure 15 (Rule 2). ‘, , , , Concave mirror, , 4, Fe, a, , FIGURE 15, , 3. Incident ray of light passing through the centre of curvature of a, spherical mirror., , Any incident ray of light passing through the centre of curvature (©) of, , a spherical mirror retraces its path after reflection as shown in figure 16, (Rule 3)., , When a ray of light passes through the centre of curvature and falls, on the mirror, then Zi = 0. According to the law of reflection, Zi =, , 4r, so Zr must be zero. Hence, it retraces its path after reflection, (figure 16)., , 4. Incident ray of light travelling obliquely to the principal axis is _, , reflected obliquely after striking a spherical mirror at its pole as shown 4, in figure 17 (Rule 4),, , Concave mirror, , FIGURE 17, , ight-Reftectio!, JM, , 1, Image form, ; n ¢, Consider eS, parallel to the, from 2 concay, 5 s show, mirror 4 i, Characteristic, () Image is ¢, (i) Image is:, 2. Image fori, concave mirre, Consider an, mirror. A ray, axis. Accordi, passes throug!, from point I, mirror and a, This reflectis, image A’B’ is, Characteristi, (2 The size, is dimini, (ii) Image is, 3. Image forn, Consider an |, A ray of ligh, the concave 1, the mirror P, Point B afte, Rule 2, this ;, intersect the, centre of cury, Characteristic, @ The size «, (i) The imag, é Image forr, Principal focy