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A container is filled with water (mu=1.3...

A container is filled with water `(mu=1.33)` upto a height of 33.25 cm. A concave mirror is placed 15cm above the water level and the image of an object placed at the bottom is formed 25 cm below the water level. Focal length of the mirror is

A

10

B

15

C

20

D

`-18.31`

Text Solution

Verified by Experts

The correct Answer is:
D
`d_("app") = ("Actual depth ")/( n) = (33 . 25)/( 1.33) = 25 ` cm
`u = - (15 + 25) = - 40 cm`
and ` v = - [ 15 + (25)/( 1.33) ] = - 33.79` cm
Where `(25)/( 1.33) ` is the real depth of image
`(1)/(f) = (1)/(v) + (1)/(u) rArr f = - 18.31 ` cm
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