Question

Ray of light that passes through the optical center of a convex lens will 


a)pass through the principal focus

b)deviate from the optical center

c)remain un-deviated

d)remain parallel to the principal axis

​

Answer 1

Explanation:

Optical center

Any ray passing through the optical center will pass undeviated. Optical center is the center of the lens.

Hope this helps mate ☺️.

Answer 2

Answer:

C) remain undeviated

Explanation:

The middle part of the lens will just act as a rectangular glass slab. We may verify it by cutting the lens horizontally. Now we know that rectangular glass slabs refract light in such a way that emergent is parallel to the incident. Actually the same happens when the ray passes through the optical center. This can be observed in a thick lens. In thin lenses the perpendicular distance between the extended incident ray and extended emergent ray is negligible. So we can say that the light ray passes through the optical center without deviation.