Question

A concave mirror produces three times magnified image on a screen.If the object is placed 20cm in front of mirror,how far is the screen front object?​

Answer 1

Answer:

the distance of the object from screen is 40cm

Explanation:

the mirror produces image 3times larger than object i.e the linear magnification is 3:1

so, the ratio of screen distance and object distance is also 3:1

let the distance of screen from mirror be X.

so, X / object distance =3/1

or, X/20=3

or, X=60

the distance of the screen from the mirror is 60 cm and distance of the object from the mirror is 20 cm

so, the distance of the screen from object =60-20=40cm

Answer 2

above is your answer

I hope it is brainleast answer