ans fastly plzz ..
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1) we know that , the normal always passes through the center of curvature in case of spherical mirrors
if the light passes through the center of curvature means angle of incidence is 0°
2)concave mirrors create real and enlarged images hence it cannot be used as a rate view mirror
3)f=R/2
4)oil lamp
I hope this helps ( ╹▽╹ )
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