(i) Determining the Optically Denser Medium:
To determine which medium is optically denser, we need to compare the refractive indices of the given mediums. The medium with the higher refractive index is considered denser.

In this case, the refractive indices of A, B, and C are 1.44, 1.54, and 1.36 respectively. Comparing these values, we can conclude that:

The medium B (with a refractive index of 1.54) is optically denser than medium A (with a refractive index of 1.44).
The medium B (with a refractive index of 1.54) is also optically denser than medium C (with a refractive index of 1.36).

Therefore, medium B is the optically denser medium among A, B, and C.

(ii) Direction of Bending when Light Travels from C to A:
When light travels from a rarer medium (lower refractive index) to a denser medium (higher refractive index), it bends towards the normal.

In this scenario, light is traveling from medium C (refractive index 1.36) to medium A (refractive index 1.44). Since the refractive index of A is higher than C, the light will bend towards the normal when it enters medium A.

Therefore, the light will bend towards the normal when it travels from medium C to medium A.

(iii) Direction of Bending when Light Travels from A to B:
When light travels from a denser medium (higher refractive index) to a rarer medium (lower refractive index), it bends away from the normal.

In this case, light is traveling from medium A (refractive index 1.44) to medium B (refractive index 1.54). As the refractive index of A is lower than that of B, the light will bend away from the normal when it enters medium B.

Therefore, the light will bend away from the normal when it travels from medium A to medium B.

Related: Magnification and Power of a Lens

- Magnification:
Magnification is a measure of how much larger or smaller an image appears compared to the object. It is given by the ratio of the size of the image to the size of the object.

Mathematically, magnification (m) is defined as:
m = Height of the image (hi) / Height of the object (ho)

The magnification can be positive or negative, depending on whether the image is upright (positive) or inverted (negative).

- Power of a Lens:
The power of a lens is a measure of its ability to converge or diverge light. It is denoted by the symbol 'P' and is measured in diopters (D).

The power of a lens is given by the formula:
P = 1 / f

where 'f' is the focal length of the lens in meters.

A lens with positive power (P > 0) is called a converging lens as it brings parallel rays of light towards a focus. A lens with negative power (P < 0)="" is="" called="" a="" diverging="" lens="" as="" it="" spreads="" out="" parallel="" rays="" of="" />

- Relationship between Power and Focal Length:
The power of a lens and its focal length are inversely proportional. A lens with a shorter focal length has a

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