Question

Ans plz ....!! Want correct ans wth explanation


Savita takes a mirror which is depressed at the centre and mounts it on a mirror stand. An erect and enlarged image of his face is formed. SHe places the mirror on a stand along a metre scale at 30cm mark. In front of this mirror,she mounts a white screen and moves it back and froth along the metre scale till a highly sharp well defined image of a distant tree is formed on the screen at 60 cm mark. Find the type of mirror and focal length

Answer 1

follow me......... if it's helpfull

Answer 2

Answer:

( i )

Sunita used concave mirror.

Focal length of mirror is :

= > 35  cm - 15 cm

= > 20 cm .

( ii )

As we know concave mirror always form image at focus when object is placed at infinity. Hence image is form sharp  image at it was placed at 35 cm .