A convex lens of focal length 20 cm is cut into two halves along principal axis then focal length of each part will be ………………… 

B) The ray does not deviate from its path

A) converge at focus

D) between focal point and optic centre

B) Both statements are false

Correct option is  B) double

Correct option is  C) 20 cm

Correct option is  C) 40 cm

1. A lens is said to be convex if it is thicker in the middle and narrowing towards the periphery. According to Cartesian sign convention, its focal length is positive. 2....

 U = -12 f = -10  1/v - 1/u = 1/f 1/v + 1/12 = 1/10 1/v = 1/60  \(-\frac{1}{v^2} \)dv or \(\frac{1}{u^2} \)du du = \(\frac{v^2}{u^2} \)du \( \frac{v}{u} \)= same path △u1 = △u2 = 1mm △u1 = △v2  △v2 = vf - vi  x2 = △v2 + 1mm x2...