an object is placed at 20 cm from a concave mirror of focal length 10 cm. find the position and the nature of the image formed. draw ray diagram to explain the formation of image (not to scale)
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Answered by
160
concave mirror
u=-20
f=-10
1/f=1/v+1/u
1/-10=1/v+1/-20
1/v=1/20-1/10
1/v=1-2/20
1/v=-1/20
v=-20
image is formed 20cm from the pole in front of the lens
nature:
m=-v/u
=-(-20)/-20
=-1
so the image is real, inverted and same size image
u=-20
f=-10
1/f=1/v+1/u
1/-10=1/v+1/-20
1/v=1/20-1/10
1/v=1-2/20
1/v=-1/20
v=-20
image is formed 20cm from the pole in front of the lens
nature:
m=-v/u
=-(-20)/-20
=-1
so the image is real, inverted and same size image
Anonymous:
so?
I wrote -20 only
can't u see
put the value of u in m= -v/u therefore -(-20)/-20 and its -1
ok ok
iz didn't notice that
I didn't*
sorry
have changed
yeah its all right
Answered by
8
see image hahahahahaah
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