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If you are the employee, you can check with your employer or visit the regional epf office to find out the pf account number
Consider a ray of light AB, parallel to the principal axis, incident on a spherical mirror at point B. The normal to the surface at point B is CB and CP = CB = R, is the radius of curvature. The ray AB, after reflection from mirror will pass through F (concave mirror) or will appear to diverge from F (convex mirror) and obeys law of reflection, i.e., i = r. From the geometry of the figure, If the aperture of the mirror is small, B lies close to P, BF = PF or FC = FP = PF or PC = PF + FC = PF + PF or R = 2 PF = 2f or F=R/2 or 2F=R Hope this helps............
Laos
It is: 1/60 of an hour
PF of 190 = 2 x 5 x 19