A person can read at the closest distance of . In order for him to read at . Identify the defect, nature, and power of the lens?
Step 1: Type of defect and type of lens used for correction
Step 2: Given
Object distance from the optic center
Image distance from the optic center
the focal length of the lens
Step 3: Formula used
from the lens formula,
Step 4: Calculation
Hence, the defect is myopia, the lens used is diverging and power is .