Question

an object is placed at 25cm in front of concave mirror whose focal length is 10 cm. calculate the nature, size and position of the image​

Answer 1

Answer:

Given,

Object distance, u=25cm

Focal length, f=20cm

From mirror formula

f

1

=

v

1

+

u

1

−20

1

=

v

1

−

25

1

⇒

v

1

=−

20

1

+

25

1

v=100cm

The image will be real, inverted magnified

Explanation:

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Answer 2

Answer:

Given that,

 Object distance, u=−25cm,Focal length,f=10cm

From lens formula,  

v/1 −u/1 = f/1

​⟹v/1

=f/1+u/1​

⟹v/1 = 1 /10− 1/25

​⟹v/1 =5-2/50 = 3/50

⟹v=16.66cm