A plano convex lens has a thickness of 4cm when placed on a horizontal table with the curved surface in contact with it the apparent depth of the bottom most point of lens is 3cm. If the lens is nverted plane face is in contact with table, apparent depth of the centre of the plane face is found to be 25/8 cm, focal length of lens is-

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Q. A plano-convex lens has a thickness of

4 c m

. When placed on a horizontal table, with the curved surface in contact with it, the apparent depth of the bottom-most point of the lens is found to be

3 c m

. If the lens is inverted such that the plane face is in contact with the table, the apparent depth of the centre of the plane face of the lens is found to be

25 / 8 c m

. Find the focal length of the lens.

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

x \times 15

. Then value of x is:

Q. A Plano-convex lens has a thickness of

4

cm When placed on a horizontal table, with the curved surface in contact with it, the apparent depth of the bottommost part of the lens is found to be

3

cm. If the lens is inverted so that plane face is in contact with the table the apparent depth is found to be

\frac{25}{8}

cm. The focal length of the lens is

The apparent thickness of a thick plano convex lens is measured once with the plane face upward and then with the convex face upward. The value will be

Q. A plano-convex lens of focal length 30 cm has its plane surface silvered. An object is placed 40 cm from the lens on the convex side. The distance of the image from the lens is :

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