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A point light source lies on the principal axis of a concave spherical mirror with radius of curvature 160 cm. Its image appears to be back of the mirror at a distance of 70 cm from the mirror. Determine the location of the light source. |
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Answer» Solution :`(1)/(U ) +(1)/(v ) = (2)/(R )` Herev=70cm, `R=- 160cm, (1)/(u )= (2)/(R ) -(1)/(V)` ` therefore(1)/(u )= (2)/(-160 CM) - (1)/( 70cm) =- (15)/( 560cm)` ` thereforeu=- (560 )/( 15 ) cm=- 37cm` The force is at a distance of 37 cm in front of the mirror. |
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