Question

Answer with Explaination Needed ​

Answer 1

Answer:

Answer is clay.

Explanation:

because clay is an Opaque medium and rest all are either transparent or translucent. Hence, clay can not be used to make lens.

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Answer 2

$\huge\bigstar\underbrace{\mathtt\red{H} \mathtt\red{E} \mathtt\purple{L} \mathtt\blue{L} \mathtt\green{O}} \bigstar\:$

(d)Clay