Question

the focal length of a concave mirror is 12 centimetre where should an object of length 4 cm be placed so that a real image of 1 cm length is formed

Answer 1

The relationship between focal length and magnification is ... object of length 4 cm be placed so that a real image of 1 ...

Answer 2

Question:- The focal length of a concave mirror is 12 centimetre where should an object of length 4 cm be placed so that a real image of 1 cm length is formed .

Answer:- Given that,

Focal length of a concave mirror f=12cm

Object length h=4

Real image length h =1cm

We know that,

m = −v/u = −f / -f -(u)

-1 / u = −12 / −12 - u

12+u=−48

u=−48−12

u=−60cm

Hence, the object distance is 60 cm