MPSC PYQScienceLightenglish
12)a) Focal length of concave mirror and concave lens is always negative. (b) Focal length of Convex mirror and convex lens is always positive. Answer Options: 1) a correct , b incorrect 2) a and b correct 3) a and b incorrect 4) a incorrect, b correct
A.(a) correct , b incorrect
B.(a) and b correct
C.(a) and b incorrect
D.(a) incorrect, b correct
Correct answer: B