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please help me with this question
the image of a very distant object is clearly obtained when a screen is placed at 5cm in front of concave mirror.
a). find radius of curvature of mirror 
b)if another object is placed at 3 cm from it ,image distance is...

Dear student,
(a) Distant object means that the object is at infinity so the image will be formed at rhe focus. Hence focal length f = 5 cm and radius of curvature R = 2f = 10 cm
(b) F o r space C o n c a v e space m i r r o r space b o t h space u space a n d space f space a r e space n e g a t i v e 1 over f equals 1 over u plus 1 over v o r space fraction numerator 1 over denominator negative 5 end fraction equals fraction numerator 1 over denominator negative 3 end fraction plus 1 over v space o r space 1 over v space equals space 2 over 15 space o r space v space equals space 7.5 space c m

Regards

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