Question

position of object, Mirror and image in case of a
concave mirror are found to be 20cm , 80 cm and 60cm respectively. find the focal length of the mirror and draw the ray diagram.​

Answer 1

Explanation:

Concave mirror

u = -40 cm , f= -20 cm , v = ? Nature = ?

According to mirror formula

1v+1u=1f⇒1v+1−40=1−20

⇒1v−140=−120

⇒1v=−120+140=−2+140=−140

v = -40 cm

Position : Image is formed 40 cm in front of the concave mirror.

Nature : Image is real and inverted .

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