A dentist uses a mirror in front of a decayed tooth at a distance of 4 cm from the teeth to get a 4 times magnified image in the mirror. Use mirror formula to find the focal length and nature of the mirror used.
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u = -4
m = 4
m = -v/u
4 = -v/-4
16 = v
1/f = 1/v + 1/u
1/f = 1/16 + 1/-4
1/f = 1-4/16
1/f = -3/16
f = 16/-3
f = -5.33 cm
Hence it's focal length is -5.33cm
and it is a concave mirror because focal length is negative.
Hope it helped u frnd:-)
m = 4
m = -v/u
4 = -v/-4
16 = v
1/f = 1/v + 1/u
1/f = 1/16 + 1/-4
1/f = 1-4/16
1/f = -3/16
f = 16/-3
f = -5.33 cm
Hence it's focal length is -5.33cm
and it is a concave mirror because focal length is negative.
Hope it helped u frnd:-)
Anny121:
thanks friend
Answered by
1
hello this is your answer::::
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thank u
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