Question

Where must an object 2 cm tall be placed in front of a concave mirror of radius of curvature 20cm, if an erect image 4cm tall is to be obtained ?​

Answer 1

✪AnSwEr

${\tt{\red{\underline{\large{Given}}}}}$

• $\tt{h_o=2Cm,and\:placed\:on\:front\: concave\: mirror}$
• Radius of curvature=20cm
• $\sf{h_i=4}$

${\sf{\green{\underline{\large{To\:find}}}}}$

• Distance of object from mirror

${\sf{\pink{\underline{\Large{Explanation}}}}}$

• Here we clearly see that the the height bof image is erect
• it means it is made behind the mirror

From the characteristics of image of concave mirror.

• we say that the object
• is placed between focus and pole

Now

Radius of curvature = 20 =2f

=>2f=20

=>F=10

Here the distance of of object from Concave mirror is U<10