Question

The focal length is a concave mirror is 20cm find the position of the image of an object situted at a distance 30cm from the mirror full solve

Answer 1

here f =-20cm
u = -30cm
v=?
A/Q
1/f = 1/v +1/u
1/-20 = 1/v+ (1/-30)
1/-20 = 1/v - 1/30
-1/20+ 1/30 =1/v
-3 +2/60 =1/v
-1/60 = 1/v
therefore
v = -60cm

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