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Hi there! Have questions about your homework? At Brainly, there are 60 million students who want to help each other learn. Questions are usually answered in less than 10 minutes. Try it for yourself by posting a question! :D

Size of image of an object by a mirror having focal length of 20cm is observed to be reduced to 1/3rd of its size. At what distance tthe object has been

placed from the mirror? What is the nature and size?

If it is concave mirror then,f=-20cm As specific denotion h2=1/3 h1 h2/h1=1/3=m as we know that m=-v/u=1/3 v=-1/3u applied mirror formula 1/f=1/v+1/u 1/-20=-3u/1+1/u -1/20=-3u^2+1 whole divided by u cross multiply -u=-60u^2+20 60u^2-u-20=0 solve quartic equation u=71/120,u=69/120 u=0.59 and u=0.57