Question

15. An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of local
length 18 cm. At what distance from the mirror should a screen be placed, so that
a sharp focussed image can be obtained? Find the size and the nature of the image.
201 What type of lens is this?
lanefnouer​

Answer 1

I = -14 cm

Explanation:

Given:

size of object, o=+7cm

distance of object ,u=−27cm

focal length of concave mirror, f=−18cm

let us take size of image=I

so, mirror formula is = 1/v + 1/4 = 1/f

so, putting values of u and v,

1/v = 1/+8 - 1/-27

1/v = 1/-54

v=−54cm

so, image is formed on object side only.

magnification,

m=-v/4 = I/o

m= -54/-27 = I/7

I=−14cm

Hence, The image is double in size to that of object & It's Nature is real, inverted and magnified image.

MARK ME AS BRAINLIST ANSWER !!