Physicshard · Past Paper
A lens of power +5 D is submerged in a liquid of refractive index equal to that of the lens material. Its power becomes:
A+5 D
B-5 D
CZero
DInfinite
✓ Correct Answer: C — Zero
If n(lens) = n(medium), the light does not bend, so the lens acts as a plane sheet with zero power.
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