Question

Find the size, nature and pisition of image formed when an object of size 1cm is placed at a distance of 15cm from a concave mirror of focal length 10cm.

Answer 1

Answer:Nature : real image Position of image : 30cm in front of lens or -30cm Height of image : -2cm(the image is inverted)

Explanation:Explanation given in the attachment.

Hope it helps.

Answer 2

Answer:

GIVEN :

H = 1CM

U = -15CM ( you is generally considered as negative)

F = -10 ( focal lenght of concave mirror is negative)

Using mirror formula,

1/f = 1/u + 1/v

1/-10 = 1/ -15 + 1/v

1/v = 1/-10 - 1/-15

1/v = 1/-10 + 1/15

1/v = -15 +10 / 150 (taking l.c.m.)

1/v = -5/ 150

1/v = -30cm

Using magnification formula,

-v/u = m

-(-30)/-15 = m

-2 = m

Image is real and inverted (-) , enlarge (m<1)

h'/h = m

h'/1 = -2

h' = 2

image is twice the size of object..

HOPE IT HELPS YOU...