If the focal length of a mirror is 20cm and the image is reduced to 1/3 the object what is the nature of mirror and what is the object distance?

If the focal length of a mirror is 20cm and the image is reduced to 1/

1.	If the focal length of a mirror is 20cm and the image is reduced to 1/3 the object what is the nature of mirror and what is the object distance?
Answer» s SEE the answer in casesCASE 1:- m=-1/3(in CASE of concave MIRROR)f= -20 cmm= -1/3 =-v/uv=u/31/f= 1/v +1/u .=> -1/20 = 3/u + 1/ u= 4/utherefore.,, u = -80 cm.CASE 2:-M=+1/3 (IN CASE OF CONVEX MIRROR)f=+20 cm.m=+1/3 =-v/uv=-u/3.i/f=1/v+1/u.=> 1/20= -3/4 + 1/4 =-2/4therefore, u= -40 cm.hope it helps!!

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If the focal length of a mirror is 20cm and the image is reduced to 1/3 the object what is the nature of mirror and what is the object distance?

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