Question

The focal length of a convex mirror is 10 cm and the object distance is 20cm.Calculate the image distance and the magnification of the image

Answer 1

Answer:

By the mirror formula:

1/f=1/u+1/v

f=10cm

u=-20cm

v=?

1/10=1/-20+1/v

1/v=1/10+1/20

1/v=20+10/200

=30/200

=3/20

The image distance =3/20

magnification of the image= -3/20.

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Answer 2

Answer:

The image distance =3/20    

magnification of the image= -3/20.

Explanation:

The magnification produced by the lens is equal to the ratio of image distance to the object distance

By the mirror formula:  

1/f=1/u+1/v  

f=10cm  

u=-20cm      

v=?    

1/10=1/-20+1/v  

1/v=1/10+1/20    

1/v=20+10/200    

=30/200    

=3/20    

The image distance =3/20    

magnification of the image= -3/20.

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