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## What happens to the focal length of a convex lens if it is immersed in water?

Now since the focal length is inversely proportional to the (μ−1), therefore the focal length will increase. Hence the focal length of the lens **increases** when it is immersed in the water.

## Why does focal length increase in water?

Since the relative refractive index of glass with respect to water is less than that of glass with respect to air, **the bending of light at the interface of glass water is lesser and hence a parallel beam of light falling on the lens is bent less, to meet at point on the principal axis** and hence the lens has more focal …

## Does the focal length of a lens change if it is immersed in water will it increase or decrease?

**Yes**. Focal length changes when lens is immersed in water.

## Will the focal length of a lens change when it is submerged in water?

The focal length of a lens **is very much affected when immersed in water**. The reason is that the angle of refraction is dependent on the relative difference between the indices of refraction of the incoming medium and the medium of the lens. … Your eyes’ focal length change dramatically.

## Which lens has more focal length thick or thin?

Thick lens will have shorter and consequently **thin lens** will have greater focal length. Because, For a thick lens, the optical path length of the light is more, than for a thin lens, thus, the bending of light will be more in case of a thicker lens. Consequently, it has a shorter focal length.

## What can change focal length?

Picture **angle**

On the other hand, the longer the focal length, the smaller the extent captured by the lens. If the same subject is photographed from the same distance, its apparent size will decrease as the focal length gets shorter and increase as the focal length gets longer.

## What happens if lens kept in water?

When any lens or glass slab is immersed in a liquid whose refractive index is equal to that of lens, **refractive index of lens will be equal to 1 relative to that liquid**. The focal length of the lens in this case, will tend to infinity.

## What happens to focal length of concave lens in water?

when concave lens immersed in water the focal length of lens **increases** because focal length of lens is directly proportional to refractive index of medium and when immersed in water the medium become more dancer so its focal length increases.

## How many images can convex lens?

The given convex lens is made up of five different materials.So they have different refractive indices/ different focal lengths. Hence they form **five different images**.

Relationship between the power of a convex lens and the refractive index of a medium. Apparently, **focal length f is inversely proportional to the refractive index of the medium μ**. Since, Optical Power P=1f. This should imply that optical power is directly proportional to the refractive index.

## What happens to the focal length of the convex lens when it is cut horizontally?

Answer. If a convex lens is cut horizontally then **radii of curvature on both sides of the lens** i.e., R1 and R2 will remain same as before. As R1 and R2 do not change, so there will be no change in focal length of the lens.