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.