A ray of light passes through three media as shown.The speeds of light in these media obey: 
Definitions:
Restrictive Indorsement
A signature on a negotiable instrument, such as a check, that limits how the instrument can be used.
Depositary Banks
Banks that hold securities (such as shares or bonds) in custody for other parties, facilitating securities trades and dividend payments.
State of Qatar
A sovereign country located in Western Asia, occupying the small Qatar Peninsula on the northeastern coast of the Arabian Peninsula.
Negotiation
The process of discussing and arriving at a mutual agreement between parties.
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