A concave mirror has focal length 12cm. An object is placed a) 20 cm (b) 30 cm fromthe pole of mirror. List four characteristics of the image formed? About the author Serenity
Answer: Answer Correct option is C 60 cm Given that, Focal length of a concave mirror f=12cm Object length h=4 Real image length h ′ =1cm We know that, m=− u v = −f−(u) −f − u 1 = −12−u −12 12+u=−48 u=−48−12 u=−60cm Hence, the object distance is 60 cm Reply
Answer:
Answer
Correct option is
C
60 cm
Given that,
Focal length of a concave mirror f=12cm
Object length h=4
Real image length h
′
=1cm
We know that,
m=−
u
v
=
−f−(u)
−f
−
u
1
=
−12−u
−12
12+u=−48
u=−48−12
u=−60cm
Hence, the object distance is 60 cm