Question

at what distance from a concave mirror of focal length 20cm, should an object be placed to obtain a real image of same size?​

Answer 1

HEYA GM ❤

★ TO OBTAIN REAL IMAGE OF SAME SIZE.... AN OBJECT IN FRONT OF MIRROR SHOULD BE PLACED AT

» CENTER OF CURVATURE «

– WE KNOW ;; FOCAL LENGTH = 20cm..

★ F = Radius of Curvature / 2

★ Radius of Curvature = 20 × 2 = 40cm...

♥ OBJECT SHOULD BE PLACED AT 40 CM...FROM THE MIRROR ( " At centre of Curvature " ) ...

TQ ❤ ❤

Answer 2

Answer:

40cm

Explanation:

As when the object is placed at the centre of curvature of a mirror then object distance is equal to the image distance ....

so F=R/2

20cm =R/2

R=40cm Answer