Question

what will be the radius of curvature of a mirror having focal length 7.5 cm​

Answer 1

Answer:

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Explanation:

Correct option is

C

3.41 cm

Given that,

Height of object h=7.5 cm

Height of image = h’

Radius of curvature R=25 cm

Object distance u=−40 cm

Image distance = v cm

Focal length = f=

2

R

=

2

25

We know that,

v

1

+

u

1

=

f

1

v

1

=

f

1

−

u

1

v

1

=

25

2

−

40

1

v=

11

200

cm

Now, magnification is

h

h

′

=−

u

v

h

′

=h×(−

u

v

)

h

′

=−7.5×

11×(−40)

200

h

′

=3.409

h

′

=3.41cm

Hence, the height of the image is 3.41 cm

Answer 2

Answer:

2:599-4578655789tuiogfgjjkkhff