If a thin lens is dipped in water, does its forcal length change ?

Shown an object and its image formed by a thin lens. Then the nature and focal length of lens is

Focal length of convex lens having refractive index 1.5 is 2 cm. If this lens is dipped in a liquid having refractive index 1.25 its focal length will be ...... cm.

The capillary tube is dipped in water vertically it is sufficiently long so that water rises to maximum height h in the tube te length of the portion immersed in water is lgth . The lower end of the tube is closed the tube is taken out and opened again then find length of the water column remaining in the tube.

If a capillary of radius r is dipped in water the height of water that rises in it is h and its mass is M . If the radius of the capillary is doubled the mass of water that rises in the capillary will be

A point object is placed at distance of 20 cm from a thin plane - convex lens of focal length 15 cm . The plane surface of the lens is now silvered . The image created by the system is :-

An aluminium sphere is dipped into water which of the following is true ?

A beam of light converges at a point P. Now a lens is placed in the path of the convergent beam 12cm from P. At what point does the beam converge if the lens is (a) a convex lens of focal length 20cm, and (b) a concave lens of focal length 16cm?

A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Then its focal length will .........

If a wax coated capillary tube is dipped in water, then water in it will-