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In case of both, convex mirror and concave mirror, any line passing through centre of curvature of the mirror is normal to the mirror. A ray of light falling normally on the mirror, retraces its path on reflection. This is because for a normaly ray, angle of incidence, `anglei=0^@`. As angle of reflection is equal to angle of incidence, i.e., `angle r=angle i` , therefore, `angle r=0^@`. That is why the path of the ray normally on the mirror is retraced.
Read the above passage and answer the following questions :
(i) Do the rays passing through principal focus of mirror fall normally on the mirror. (ii) Which is closer to the mirror, principal focus or centre of curvature of the mirror ? (iii) What values of life do you learn from this concept?

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(i) No, the rays passing through principal focus of mirror do not fall normally on the mirror.
(ii) Principal focus F of the mirror is closer to the pole P of the mirror, compared to the centre of curvature, C.
Infact, `PF=1/2PC`.
(iii) This concept implies that one should preferably stay along normal to avoid deflections. Staying in normal mode will save you from large scale fluctuations. They say, too much of everything is bad. So eat normal, sleep normal, play normal, study normal, talk normal, listen normal and so on. Prefer not to do anything abnormally.

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