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A parallel beam of light enters a clear ...

A parallel beam of light enters a clear plastic bead `2.50 cm` in diameter and index `1.44.` At what point beyond the bead are these rays brought to a focus?

Text Solution

Verified by Experts

The correct Answer is:
C, D

Using `mu_2/v-mu_1/u=(mu_2-mu_1)/R`, we get
`1.44/v-1.0/oo=(1.44-1.0)/(+1.25)`
`:. v=4.0 cm`
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