Question

a point object is placed at a distance of 20 cm from a convex mirror of focal length 20cm what is the position and nature of the image?​

Answer 1

Explanation:

This one is easy forsooth! Position of the image is behind the mirror(11.111cm) and the image is diminished in nature. object distance 'u' is 20 cm and focal length 'f' is 25 cm.

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Answer 2

Answer:

This one is easy forsooth! Position of the image is behind the mirror(11.111cm) and the image is diminished in nature. object distance 'u' is 20 cm and focal length 'f' is 25 cm.

Explanation:

f(focal length) =+25cm (convex mirror has always positive focal length)

By mirror formula

1/f=1/v+1/u

1/25=-1/20+1/v

1/25+1/20=1/v

(4+5)/100=1/v

9/100=1/v

V=100/9

V=11.111cm ( image position)

Position of the image is behind the mirror since v comes out to be positive and the image is small in nature.