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1.(a) Both A and R are true and R is the correct explanation of A

2.(a) Both A and R are true and R is the correct explanation of A

3.(c) A is true but R is false

4 (b) Both A and R are true but R is NOT the correct explanation of A

Explanation:-

Because D = 25 cm

\(\therefore\) m = 1 + \(\frac{25}{f}\)

Let m = 5

\(\therefore \) 5 = 1 + \(\frac{25}{f}\)

f = \(\frac{25}{4}\) = 6.25 cm

In normal setting, m = \(\frac{D}{f}\)

If m = 10 also, 'f' gets smaller.

so, for microscope, f = 30 cm not possible.

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