A fish in a flat-sided aquarium sees a can of fish food on the counter. To the fish's eye, the can looks to be 43 cmcm outside the aquarium. Required:
What is the actual distance between the can and the aquarium?

The actual distance is  

Explanation:

From the question we are told that

     The  distance of the can is d =  43 cm  =  0.43 m

Generally the actual distance is mathematically represented as

Where   are the refractive index of air and water and their value is  

So

the device is called “ rocket engine”

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explanation: