an object is placed at a distance of 10cm from the pole of a concave mirror lmage is formed at 6cm from its pole .then the focal length of the mirror.
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Answered by
7
given,
u = -10 cm
v = -6 cm
use formula,
1/v + 1/u = 1/f
1/(-10) + 1/( -6) = 1/f
-16/60 = 1/f
f = - 60/16 = -15/4 cm
u = -10 cm
v = -6 cm
use formula,
1/v + 1/u = 1/f
1/(-10) + 1/( -6) = 1/f
-16/60 = 1/f
f = - 60/16 = -15/4 cm
Answered by
4
Given :
u = -10 cm
v = -6 cm
f = ?
_______________________
Using mirror formula ;
(1/f) = (1/v) + (1/u)
==========================
1/f = (1/-6) + (1/-10)
1/f = (-5-3)/30
f = 30/-8
f = 15/-4
f = -3.75 cm
-----------------------------------
The focal length of the concave mirror is 3.75 cm
u = -10 cm
v = -6 cm
f = ?
_______________________
Using mirror formula ;
(1/f) = (1/v) + (1/u)
==========================
1/f = (1/-6) + (1/-10)
1/f = (-5-3)/30
f = 30/-8
f = 15/-4
f = -3.75 cm
-----------------------------------
The focal length of the concave mirror is 3.75 cm
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