A double convex lens has two surfaces of equal radii R and refractive index m=1.5. We have,

Figure (18-Q3) shows three transparent media of refractive indices μ1, μ2 and μ3. A point object O is placed in the medium μ2. If the entire medium on the right of the spherical surface has refractive index μ₁, the image forms at O’. If this entire medium has refractive index μ₃, the image forms at O’’. In the situation shown,

Four modifications are suggested in the lens formula to include the effect of the thickness t of the lens. Which one is likely to be correct?

A point source of light is placed at a distance of 2f from a converging lens of focal length f. The intensity on the other side of the lens is maximum at a distance

A parallel beam of light is incident on a converging lens parallel to its principal axis. As one moves away from the lens on the other side on its principal axis, the intensity of light