NEET 2026
- Exam
- NEET
- Year
- 2026
- Subject
- Physics
- Chapter
- Ray Optics
NEET 2026 · Physics · Ray Optics
In a concave lens, a ray of light emanating from the object...
In a concave lens, a ray of light emanating from the object parallel to the principal axis of the lens, after refraction :
Options
- Apasses through 2F, which is the radius of curvature of the lens.
- Bappears to diverge from the first principal focus.
- Cemerges parallel to the principal axis.
- Dpasses through the second principal focus.
Correct answer
B. appears to diverge from the first principal focus.
Step-by-step solution
According to the rules of refraction for spherical lenses, a ray of light parallel to the principal axis of a concave lens diverges after refraction.
When this refracted ray is extended backwards, it appears to diverge from the principal focus located on the same side of the lens as the object.
By standard convention, the principal focus on the object side (left side) is termed the first principal focus ().
Thus, the ray appears to diverge from the first principal focus.
Answer: appears to diverge from the first principal focus.
When this refracted ray is extended backwards, it appears to diverge from the principal focus located on the same side of the lens as the object.
By standard convention, the principal focus on the object side (left side) is termed the first principal focus ().
Thus, the ray appears to diverge from the first principal focus.
Answer: appears to diverge from the first principal focus.