Day: July 5, 2026

Question 7 Define second principal focus? Question 8 What do you mean by aperture of lens? Question 9 What are converging lenses? Question 10 what are diverging lenses? Question 11 Define second focal plane? Terms used in Lenses (1) Principal Axis (2) Optical centre (o) : A point in or out of lens through which ray of light pass undeviated.