A parallel beam of light passes through a lens held at O as shown in Fig. What is the nature of the lens?

If parallel beam of light falls on a convex lens. The path of the rays is shown in fig. It follows that

Things always look small on viewing through a lens. What is the nature of the lens?

A convex lens of focal length 1 meter and a concave lens fo focal length 0.25 meter and kept 0.75 meter apart. A parallel beam of light first passes through the ocnvex lens, then through the concave lens and comes to a focus 0.5m away from the concave lens.

A convex lens of focal length 1 meter and a concave lens fo focal length 0.25 meter and kept 0.75 meter apart. A parallel beam of light first passes through the ocnvex lens, then through the concave lens and comes to a focus 0.5m away from the concave lens.

A convex lens of focal length 1 meter and a concave lens of focal length 0.25 meter are kept 0.75 meter apart. A parallel beam of light first passes throught the convex lens, then through the concave lens and comes to a focus 0.5 m away from the the concave lens.

If a convergent beam of light passes through a diverging lens, the result

If a convergent beam of light passes through a diverging lens, the result

A symmetrical bioconcave lens having radius of curvature R is made up to two different materials as shown in figure. A parallel beam of light passing through the lens appear to diverge from two different points. Find the distance between them.