Question

(b) A convex lens of focal length 0.10 m is placed in front of a concave na
coaxial with each other. The lens is 0.40 m from the apex of the mirror When an
object is placed on the axis at a distance of 0.15 m from the lens on the other
the image is found to coincide with the object. Find the focal length of the mirror​

Answer 1

Answer:

the mirror.

So focal length of mirror f=

2

MI

For lens,

f

1

=

v

1

−

u

1

v

1

=

f

1

+

u

1

Here , f=+10cm,u=−15cm

v

1

=

10

1

+

−15

1

v=+30cm

MI=LI−LM

=30−10=20cm

f=

2

MI

=

2

20

f=10cm

solution

Explanation:

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