THE MPU HR SEC SCHOOL PRESENTED BY M

THE MPU HR SEC SCHOOL PRESENTED BY M. DINESH BABU M. A. MOSES SUSAI NATHAN J. NIJAMUDEN C. P. SATHISH M. SURENDAR GUIDED BY B. RAVINDHRANATH.

LENS A LENS IS A PIECE OF TRANSPARENT MATERIAL BOUND BY CURVED SURFACES

CONVEX LENS IS A LENS WHICH IS THICKER IN THE MIDDLE THAN AT THE EDGES AND RAYS OF LIGHT CONVERGE AFTER PASSING THROUGH THEM.

CONCAVE LENS IS A LENS WHICH IS THINNER IN THE MIDDLE THAN AT THE EDGES AND RAYS OF LIGHT DIVERGE AFTER PASSING THROUGH THEM.

CONJUGATE FOCI ARE A PAIR OF POINTS ON THE PRINCIPAL AXIS OF THE LENS SUCH THAT AN OBJECT AT ONE OF THE POINTS PRODUCES AN IMAGE AT THE OTHER POINT.

HYPERMETROPIA IS LONG SIGHT. IT IS A DEFECT OF THE EYE WHEN DISTANT OBJECTS CAN BE SEEN BY THE EYE, BUT NEAR OBJECTS CANNOT BE SEEN DISTINCTLY. http: //www. washington. edu/medical/uwmc_clinics/eye/UW Department of Ophthalmology CATARACT SURGERY. htm

REFERENCES http: //depts. washington. edu/ophthweb/trial. h tml http: //www. schoolcircle. com/studycircle/phy sics/ph-ms-b-icse-lens-pagetwo. htm http: //www. schoolcircle. com/studycircle/phy sics/ph_ms_b_icse_lens_pageone. htm. http: //hyperphysics. phyastr. gsu. edu/hbase/geoopt/imgfor. html. c 1 http: //hyperphysics. phy_astr. gsu. edu/hbase/ geoopt/imgfor. html#c 1 http: //www. ccgateech. edu/scivis/-vbbin/shtml. execation/java + Encyclopedia on CD_ROM.