Page 1 :
Solve the following questions, , 1. Find the radius of curvature of the convex surface of a plane convex lens, whose focal, length is 0.3m and the refractive index of the material of the lens is 1.5?, , 2. A convex lens has a focal length 0.2m and made of glass is immersed in water (refractive, index=1.33) find the change in focal length of the lens?, , 3. An equi—convex lens of radius of curvature R is cut into two equal parts by a vertical, plane, so it becomes a plano-convex lens. If f is the focal length of equi—convex lens, then, what will be focal length of the plano —convex lens?, , 4. An object of size 3.0 cm is placed 14 cm in front of a concave lens of focal length 21 cm., Describe the image produced by the lens. What happens if the object is moved further away, from the lens?, , 5.A beam of light converges at a point P. Now a lens is placed in the path of the convergent, beam 12 cm from P. At what point does the beam converge if the lens is (a) a convex lens of, focal length 20 cm, and (b) a concave lens of focal length 16 cm?