Question

A concave mirror produces a 3 times magnified image on an object if focal length of mirror 10 centimetre then find object distance​

Answer 1

It will be found to be equal to 6 cm. Thus, object is placed at a distance of 6 cm × 5 = 30 cm from the lens. A concave lens of focal length 15 cm forms an image 10 cm from the lens

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Answer 2

Explanation:

mirror-concave

m= height of image/height of the object =-v/u

let the height of the object = h

and height of image=-3h

therefore

-3/h=-v/u

then v/u=3

object distance =-10cm

v= -3*10

v=-30