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The focal length of a spherical mirror i...

The focal length of a spherical mirror is given by` f=R/2` , where R is radius of curvature of the mirror. For a given spherical mirror made of steel the focal length is f = 24.0 cm. Find its new focal length if temperature increases by `50^(@)C`. Given = `alpha_("Steel")=1.2 xx 10^(- 5).^(@)C^(-1)`

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