A concave mirror of focal length 20cm is placed at a distance of 50cm from a wall . How far from a wall should an object to be placed to form it's real image on the wall??
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A concave mirror of focal length 20cm is placed at a distance of 50cm from a wall . How far from a wall should an object to be placed to form it's real image on the wall??
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Answer:
using formula of mirror
Explanation:
1/v - 1/u = 1/f
1/(-50) - 1/u = 1/(-20)
from here u can calculate value of u
Answer:
100mts...............