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A tank of height 33.25 cm is completely filled with a liquid of Index of refraction 1.33. A concave mirror of focal length 15.0 cm is placed above the tank as shown In figure. An object is placed at the bottom of the tank on the axis of concave mirror and its image is formed at a distance 25.0 cm below the surface of the liquid. The focal length of the mirror is

A tank of height 33.25 cm is completely filled with a liquid of Index of refraction 1.33. A concave mirror of focal length 15.0 cm is placed above the tank as shown In figure. An object is placed at the bottom of the tank on the axis of concave mirror and its image is formed at a distance 25.0 cm below the surface of the liquid. The focal length of the mirror is

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2 Answers

Arun
25750 Points
6 years ago
Dear Sarthak
 
Diatance of object from mirror = 15 + (33.25 *3/4) = 39.93 cm
Distance of image from mirror = 15 + (25*3/4) = 33.75 cm
For mirror
1/v + 1/u = 1/f
1/-33.75 - 1/39.93 = 1/f
f = 18.3 cm
Sarthak Khandelwal
13 Points
6 years ago
Ans is 25 this question is of arihant bitsat practice set 5.

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