If 'slab' times speed equals power, what will be the dimension equation for slab

If 'slap' times speed equals power, what is the dimensional formula for 'slep' ?

What is the dimension of time in power ?

Muscle times speed equals power. What does muscle stand for?

Combination Of Slab

Dimensions of time in power are

Slabs In Series Combination

Image Formation By A Slab

Image formation by slab

A rectangular slab of refractive index mu is placed over another slab of refractive index 3 both slabs being identical in dimensions.If a coin is placed below the lower slab for what value of mu will the coin appear to be placed at the interface between the slabs when viewed from the top