Rules For Image Formation In Lenses
Rules For Image Formation In Lenses
Only two rays from the same point of an object are needed for image formation and the point where the rays after refraction through the lens intersect or appear to intersect is the image of the object. If they actually intersect each other the image is real and if they appear to intersect the image is said to be virtual. In order to locate the image formed by a lens graphically following rules are adopted
Rays used for ray diagram of Image formation:
1. We choose the ray that is incident parallel to the principal axis. In case of a convex lens, the transmitted ray will pass through the focus, and in case of a concave lens, the transmitted ray’s backward projection will pass through the focus.
Which of the following are correct ? (a) While identifying the position of the image formation in case of lens we can choose the ray that is incident parallel to the principal axis. In the case of convex lens, the transmitted ray will pass through the focus, and in case of a concave lens, the transmitted ray’s backward projection will pass through the focus. (b) While identifying the position of the image formation in case of lens we can choose the ray that passes through the optical centre of the lens (c) While identifying the position of the image formation in case of lens we can choose a ray passing through first focus or directed towards it, after refraction from the lens becomes parallel to the principal axis | |||
| Right Option : D | |||
| View Explanation | |||
Which of the following are correct ? (a) If the rays after refraction from the lens actually intersect each other the image is virtual and if they appear to intersect the image is said to be real . (b) While identifying the position of the image formation in case of lens we can choose the ray that passes through the optical centre of the lens. (c) In the case of lens refraction occurs at both the surfaces once when the ray enters the lens and then at the surface when the ray comes out of the lens. | |||
| Right Option : B | |||
| View Explanation | |||
Which of the following are correct ? (a) While identifying the position of the image formation in case of lens we can choose the ray that is incident parallel to the principal axis. (b) While identifying the position of the image formation in case of lens we can choose the ray that passes through the optical centre of the lens | |||
| Right Option : C | |||
| View Explanation | |||
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