A convex lens made of glass, with refractive index , is placed in a medium of refractive index . A parallel beam of light entering the lens ________.
diverges
Step 1: Analyzing given data:
Refractive Index of the lens
Refractive Index of the medium:
Step 2: Finding the nature of the lens:
According to the lens maker's formula;
(where f is the resultant focal length and , are the radii of curvature)
Let (because radii of curvature will be constant)
Here, we are given that: and
will be negative.
will be negative.
Since is negative, the lens will act as a diverging lens.
Thus, a parallel beam of light entering the lens diverges.
Hence, Option (A) is the correct answer.