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A glass lens sits in a liquid of the same refractive index. It then acts like:
AA strong convex lens
BA weak concave lens
CA curved mirror
DA plain glass slab
Answer & Solution
Correct answer: D. A plain glass slab
With n2 equal to n1 the factor (n2 - n1)/n1 is zero, so 1/f is zero and the lens neither converges nor diverges light.
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