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A plano-convex lens has a thickness of 4 cm. When placed on a horiz. table , with the curved surface in contact with it , the apparent depth of the bottom most pt. of the lens is found to be 3 cm. If the lens is inverted such that the the table , the apparent depth of the centre of the plane face of the lens is found to be 25/8 cm. Find the focal length of the lens. I m gettin the ans 75 cm while the ans given is 72 cm and 75 cm.... can som1 explain how the ans can be 72 also??


 A plano-convex lens has a thickness of 4 cm. When placed on a horiz. table , with the curved surface in contact with it , the apparent depth of the bottom most pt. of the lens is found to be 3 cm. If the lens is inverted such that the the table , the apparent depth of the centre of the plane face of the lens is found to be 25/8 cm. Find the focal length of the lens.

 
I m gettin the ans 75 cm
 
while the ans given is 72 cm and 75 cm....
 
can som1 explain how the ans can be 72 also??


Grade:11

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