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General Physics

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

Question image for A tank of height 33.25 cm is completely filled wit

Sarthak Khandelwal

8 Years agoGrade

2 Answers

Arun

8 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

8 Years ago

Ans is 25 this question is of arihant bitsat practice set 5.

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