Practicing Success
CUET Preparation Today
CUET
Physics
Ray Optics
The radii of curvature of a double convex lens are 15 cm and 10 cm and its refractive index is 1.3. Its focal length will be:
-10 cm
+10 cm
+20 cm
+12.5 cm
The correct answer is Option (3) → +20 cm