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 Nature of light Important features of light Reflection of light Use of mirror (Periscope) Refraction of light Refractive index Critical angle Total internal reflection Use of prism (Periscope) Fiber-optics Convex lens Behavior of standard rays after passing through convex lens Image formed by convex lens Nature and position of image produced by convex lens Principle of camera Dispersion of light Newton's experiment for dispersion of light Improvement in Newton's experiment for dispersion of light Recombination of colors Rainbow Reflection through plane mirror Image through plane mirror Test Yourself

## Image formed by convex lens

In each ray diagram, in the figure below two rays are drawn from the top of the object

(a) When an object is placed in front of a convex lens at distance greater than 2f, its image will be formed between F and 2F, as shown in the figure below. The image will be diminished real and inverted.

(b) When an object is placed at 2F in front of a convex lensThe image will be formed at 2F as shown in he figure below. The image will be of the same size, real but inverted.

(c) When object is placed in front of a convex lens between between F and 2F. The image will be formed at a distance beyond 2F from the lens as shown in the figure below. The image will be magnified, real and inverted.

(d) When object is at F in front of the lens, its image will be at infinity, much enlarged, real and inverted as shown in the figure below.

(e) When the object is placed between the lens and its principal focus. Then the image will be formed on the same side behind the object. The image will be magnified, errect and virtual as shown in the figure below.

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