Question

An object size 7.0 cm is placed at 27 CM in front of concave mirror of focal length 18 cm at what distance from the mirror should a screen placed so that us sharp focus image can be obtained find the size and the nature of the image ​

Answer 1

We are given a concave mirror which has a focal length of 18 cm. An object of height 7 cm is placed in front of the concave mirror such that it is 27 cm away from the mirror. The image of the object which was kept 27 cm away from the mirror is formed at 54 cm in front of the mirror.

Answer 2

Answer:

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 

v1+u1=f1

so, putting values of u and v,

v1=−181−−271

v1=−541

v=−54cm

so, image is formed on object side only.

magnification,

m=u−v=oI

m=−−27−54=7I

I=−14cm

so, image is double in size to that of object.

Nature: real, inverted and magnified image.

Explanation:

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