First slide

Huygen's Wave Theory

Question

Figure shows a wave front P passing through two systems A and B, and emerging as Q and then as R. The systems A and B could, respectively, be

Moderate

A

a prism and a convergent lens
B

a convergent lens and a Prism
C

a divergent lens and a Prism
D

a convergent lens and a divergent lens

Solution

P to Q convergence increasing, Q to R direction changing.

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