A concave mirror of focal length 10 cm is placed at a distance of 35 cm from a wall. How far from the wall and object be placed so that its image formed by the mirror falls on the wall?
Answers
Answered by
4
Answer:
focal length in concave mirror is negative
the object distance =1/u = 1/v-1/f
= 1/-35-1/(-10)
= -(7-2)/ 70
= -5/ 70
= -14
Answered by
3
The distance between wall and the object is 21 cm.
Given:
Focal length = f = 10 cm
Object distance = v = 35 cm
Explanation:
The mirror formula is given as:
1/f = 1/v + 1/u
1/u = 1/f - 1/v
On substituting the values, we get,
1/u = -1/10 + 1/35
1/u = -1/14
∴ u = -14 cm
The distance between the wall and the object is:
d = 35 cm - 14 cm
∴ d = 21 cm
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