a concave mirror is made from a glass sphere of diameter 0.4 M its focal length is
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if diameter is 0.4m then focal length
diameter/4 = 0.4/4
= 0.1 m
diameter/4 = 0.4/4
= 0.1 m
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1
diameter =0.4 m
radius of sphere =0.4/2=0.2 m= centre of curvature
and c=2f
so .0.2=2f
f=0.2/2=0.1m or 10 cm
focus =10cm
radius of sphere =0.4/2=0.2 m= centre of curvature
and c=2f
so .0.2=2f
f=0.2/2=0.1m or 10 cm
focus =10cm
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