1) A mirror with a focal length 20 cm has a 4.0 cm tall object placed 100 cm in

Question

1)              A mirror with a focal length 20 cm has a 4.0 cm tall object placed 100 cm in front of it. What is the position of the image?

A)         20 cm in front of the mirror

B)           20cm behind the mirror

C)          25 cm in front of the mirror

   25 cm behind the mirror

A mirror with a focal length 20 cm has a 4.0 cm tall object placed 100 cm in front of it. What is the position of the image? 20 cm in front of the mirror 20cm behind the mirror 25 cm in front of the mirror 25 cm behind the mirror

Explanation / Answer

focal length,f=-20 cms

u=-100cms

mirror formula 1/f=1/u+1/v

1/-20=1/-100+1/v

1/v=-1/25

hence 25 cms infront of the mirror

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