Question

Does focal length of a spherical mirror changes when it is completely immersed in the water ? Predict and write the reason

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Answer 1

QUESTION :-

Does focal length of a spherical mirror changes when it is completely immersed in the water ? Predict and write the reason

ANSWER :-

No, focal length does changes when mirror is immersed completely in the water. Because reflection does not depend on surrounding medium.

Answer 2

$\huge{\mathcal{\purple{A}\green{N}\pink{S}\blue{W}\purple{E}\green{R}\pink{!}}}$

Here u=(-40)cm,f=(-120)cm.

1/v+1/u=1/f

=>1/v=1/f-1/u

=1/(-120)-(-1/40)

=(1/40)-1/120

=1/60

=>v=60cm.

so,

magnification=60/(-40)=-1.5

=>the image is virtual,magnified, erect.