a convex mirror forms the image of the object placed at the distance of 40 cm in front of the mirror at distance 10 cm find the focal length of the mirror
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Explanation:
given: u = 40 CM ( negative)
v = 10 ( positive)
f = ?
since the image formed by a convex mirror is always virtual, erect and on other side of mirror.
from relation 1 / u + 1/v = 1/ f,
1/-40 + + 1/10 = 1/ f
1/ f= -1+4/ 40
1/ f = 3/ 40
f= 40/ 3 = 13•33
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