what happen after refraction when: I. a ray of light parallel to the principal axis passes through a concave lens ? (ii) a ray of light falls on a convex lens while passing through its principal focus ? (iii) a ray of light passes through the optical centre of a convex lens ?
Hello Aspirant,
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1. When the parallel rays of light pass through a concave lens to the principal axis, it deviates from its focal point and refracts the light rays. Due to this reason, it is called the Concave or Diverging lens. An incident light ray parallel to the principal axis of a concave lens, passes through it and diverges.
2. When ray of light crossing through a principal focus, after refraction from a convex lens, will appear parallel to the principal axis. A ray of light developing to match at the principal focus of a concave lens, after refraction, will develop parallel to the principal axis.
3. One ray of light becomes parallel to the principal axis of the lens and thus, passes through another focus after refraction through the lens. Another ray of light passes through the optical centre of the lens and goes straight. Therefore, the image formed is: At infinity, Real and inverted, highly enlarged.
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