Question 8: NCERT Solutions for 12th Class Physics: Chapter 9-Ray Optics and Optical Instruments
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?
(a) The convex lens is placed in the path of convergent beam.
The image 1 is formed by further converging beams at a distance of 7.5 cm from lens.
(b) A concave lens is placed in the path of convergent’ beam, the concave lens further diverge the light.The image I is formed by diverged rays at 48 cm away from concave lens.
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NCERT Solutions for 12th Class Physics: Chapter 9-Ray Optics and Optical Instruments