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An object placed 10.20 cm from a concave spherical mirror produces a real image

ID: 1287581 • Letter: A

Question

An object placed 10.20 cm from a concave spherical mirror produces a real image 7.00 cm from the mirror. If the object is moved to a new position 20.0 cm from the mirror, what is the position of the image?
cm ---Location---in front of the mirrorbehind the mirror

Is the final image real or virtual?
virtualreal    
An object placed 10.20 cm from a concave spherical mirror produces a real image 7.00 cm from the mirror. If the object is moved to a new position 20.0 cm from the mirror, what is the position of the image?
cm ---Location---in front of the mirrorbehind the mirror

Is the final image real or virtual?
virtualreal    
virtualreal    

Explanation / Answer

The spherical mirror equation is

1/ p + 1/ q = 1/ f

1/ f = 1/ 10.20 cm + 1/ 7.0 cm

f = 4.15 cm

if the object is moved to 20 cm

1/ q = 1/ 4 cm - 1/ 20 cm

q = 5 cm

real and inverted image

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