Question

An abject is placed 18cms away from a concave mirror whose focal length is 10cms .Then the size of area of the image if the object be 4mm broad and 12mm long is ​

Answer 1

An abject is placed 18cms away from a concave mirror whose focal length is 10cms .Then the size of area of the image if the object be 4mm broad and 12mm long is

Answer 2

The total space taken up by a flat surface or shape of an object. The space enclosed by the boundary of a plane figure is called its area.

The size of the image is 100 square millimeters.

To find the size and area of the image formed by a concave mirror, we can use the mirror formula:

$1/f = 1/v - 1/u$

where

f is the focal length of the mirror,

u is the distance of the object from the mirror, and

v is the distance of the image from the mirror.

We are given$u = -18 cm$ (since the object is placed 18 cm away from the mirror and the mirror is concave), and $f = -10 cm$ (since it is a concave mirror, the focal length is negative).

Substituting the values, we get:

$1/-10 = 1/v - 1/-18$

Simplifying the equation, we get:

$v = -45 cm$

This means that the image is formed $45 cm$ away from the mirror, on the same side as the object. The negative sign indicates that the image is virtual and upright.

To find the size of the image, we can use the magnification formula:

$m = v/u$

Substituting the values, we get:

$m = -45/-18 = 2.5$

This means that the image is 2.5 times larger than the object.

The size of the object is 4 mm x 12 mm. So, the size of the image will be:

Size of image = Size of object x Magnification

Size of image = 4 mm x 2.5 x 12 mm x 2.5

Size of image = 100 $mm^2$

for such more question on concave mirror

https://brainly.in/question/7267709

#SPJ2