Which of the following statements about optical microscope is/are correct?1. Both the eyepiece and objective of a microscope are convex lenses.2. The magnification of a microscope increases with increase in focal length of the objective.3.The magnification of a microscope depends upon the length of the microscope tube.4. The eyepiece of a microscope is a concave lens.Select the correct answer using the code given below:

Which of the following statements about optical microscope is/are corr

1.	Which of the following statements about optical microscope is/are correct?1. Both the eyepiece and objective of a microscope are convex lenses.2. The magnification of a microscope increases with increase in focal length of the objective.3.The magnification of a microscope depends upon the length of the microscope tube.4. The eyepiece of a microscope is a concave lens.Select the correct answer using the code given below:
A.	1 and 3
B.	3 only
C.	3 and 4
D.	1, 2 and 4
Answer» B. 3 only