Question
Which three main rays are used to locate the image formed by a spherical lens? Explain by drawing diagrams.
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Answer
Image formed by spherical Icns can be located by using following, any two rays, out of three rays stated below:
(1) Ray 1 (Ray parallel to the principal axis): A ray of light from the object, parallel to the principal axis, after refraction through a convex lens, passes through the principal focus F2 on other side of the lens.
A ray of light from the object, parallel to the principal axis, after refraction through a concave lens, appears to diverge from principal focus F1 located on the same side of the lens [see figure 9.43 (a)and (b)]
(2) Ray 2 (A ray passing through the principal focus): A ray passing through the principal focus F1 after refraction through a conve lens, will emerge parallel to the principal axis.
A ray of light directed towards the principal focus F2 on the other side of a concave lens, after refraction. will emerge parallel to the principal axis. (see figure 9.44 (a) and (b)]
(3) Ray 3 (A ray passing through the optical centre):
→ A ray of light passing through the optical centre of a lens will emerge without any deviation. (This is true for a convex lens as well as concave lens.) [see figure 9.45 (a) and (b)]
(1) Ray 1 (Ray parallel to the principal axis): A ray of light from the object, parallel to the principal axis, after refraction through a convex lens, passes through the principal focus F2 on other side of the lens.
A ray of light from the object, parallel to the principal axis, after refraction through a concave lens, appears to diverge from principal focus F1 located on the same side of the lens [see figure 9.43 (a)and (b)]
(2) Ray 2 (A ray passing through the principal focus): A ray passing through the principal focus F1 after refraction through a conve lens, will emerge parallel to the principal axis.
A ray of light directed towards the principal focus F2 on the other side of a concave lens, after refraction. will emerge parallel to the principal axis. (see figure 9.44 (a) and (b)]
(3) Ray 3 (A ray passing through the optical centre):
→ A ray of light passing through the optical centre of a lens will emerge without any deviation. (This is true for a convex lens as well as concave lens.) [see figure 9.45 (a) and (b)]
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