An object is 20 cm away from a concave mirror and it is within the focal length of the mirror. If the mirror is changed to a plane mirror, the image moves 15 cm closer to the mirror.
Focal length of the concave mirror is-
Text Solution
Verified by ExpertsThe correct answer is:
D
= 
– 
= 
– 
; y = 
y – 20 = 15 (given)
= 35
f = 
cm
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