Question

The focal length of a concave mirror is 12 cm.where an object of length 4 cm be placed so that a real image of 1 cm length is formed?

Answer 1

Answer:

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

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PLZ MARK AS BRAINLIEST

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