A concave mirror of focal length 20cm produces an erect image that is four times the object, the object distance from the mirror is
a
less than 20cm
b
Between 20cm and30cm
c
Between 30cm and 40cm
d
Greater than 40cm
Explanation
Correct Option
aVideo Explanation
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Discussions (11)

Finesse11
2 months ago
using the mirror formula you get object height to be 5 now to get object distance use image height/ object height= length of camera/object distance the ANS is 25cm
b is the answer



