Question

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Answer 1

I hope it will help you.

Explanation:

6.- c)

7.- d)

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Answer 2

Answer:6(c),  7(c)

Explanation:7.  since, u=infinity,

image distance=-100cm

focal length=?

1/v-1/u=1/f

1/-100-1/infinity=1/f     (since 1/infinity=0)

1/-100-0=1/f

f=-100cm