An object 20 cm from a spherical mirror gives rise to a virtual image 15 cm behind the mirror. The type of the mirror and its focal length is




Dear Student,Given,u=-20cm,v=+15cm(Image is formed behind the mirror.)1f=1u+1v1f=-120+115=-3+460=+160f=60cmAs the focal length is positive,the mirror used is convex.Answer : (d)convex,60cmRegards.

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