List of top Physics Questions on Images Formed By Lenses asked in NEET (UG)

चित्र में दिखाए गए लेंस संयोजन में, दो लेंस \(L_1\) और \(L_2\) हैं जिनकी फोकस दूरियाँ क्रमशः \(+10cm\) और \(-10cm\) हैं। हमें प्राप्त प्रतिबिंब की स्थिति ज्ञात करनी है :

The lens combination as shown consists of two thin lenses \(L_1\) and \(L_2\) of focal lengths \(+10\ \text{cm}\) and \(-10\ \text{cm}\), respectively. The object is placed \(30\ \text{cm}\) to the left of \(L_1\), and the distance between the two lenses is \(3\ \text{cm}\). The position of the image formed is:

In a concave lens, a ray of light emanating from the object parallel to the principal axis of the lens, after refraction: ____.

In a certain camera, a combination of four similar thin convex lenses are arranged axially in contact. Then the power of the combination and the total magnification in comparison to one lens will be, respectively:

Two similar thin equi-convex lenses, of focal length \(f\) each, are kept coaxially in contact with each other such that the focal length of the combination is \(F_1\). When the space between the two lenses is filled with glycerin (which has the same refractive index (\(\mu=-1.5\)) as that of glass) then the equivalent focal length is\( F_2.\) The ratio \(F1: F2\) will be: 

A plano-convex lens fits exactly into a plano- concave lens. Their plane surfaces are parallel to each other. If lenses are made of different materials of refractive indices, $μ_1$ and $μ_2$ and R is the radius of curvature of the curved surface of the lenses, then the focal length of the combination is