Question

A 4.5cm needle is placed 12cm away from convex mirror of focal length 15cm if the location magnification of the image. Describe what happens as needle is move further from the mirror.

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Answer 1

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Answer::h1 = 4.5 cm, u = - 12 cm, / = 15 cm, v = ?

using the equation, 1/f = 1/v+ 1/u

we have, 1/15= 1/v+ 1/-12

1/15+1/12=v

By solving we get v= +6.6 cm.

Now, m= -v/u, m= +6.6 cm/ -12= 0.55

Image will diminish.

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