Question

two converging lenses are to be placed in the path of parallel rays so that the rays remain parallel after passing through both lenses. how should the lenses be arranged? explain with a neat diagram.​

Answer 1

In the above image, if $d = {f}^{1} + {f}^{2}$ then the rays will emerge parallel out of the combination of lens.

After the refraction from the lens, the ray emerges parallel to the principle axis, comes out from the focal point of the lens. This focal point will act as the first focus of the second lens, and the refracted rays will be parallel to the principle axis.

Answer 2

$\huge\color{pink}\boxed{\colorbox{Black}{ SOLUTION }}$

Textbook solution

After the refraction from the lens, the ray emerges parallel to the principle axis, comes out from the focal point of the lens. ... This focal point will act as the first focus of the second lens, and the refracted rays will be parallel to the principle axis

I really miss you soo much sweet heart

how are you and please messag.e me what sapp ok 8080921244 please me.ssage me