A ray of light, after refraction through a convex lens emerges parallel to the principal axis. The incident ray when produced appear to come from a point on principal axis. Name the point :

first focus

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first centre

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last focus

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last centre

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Solution

The correct option is A first focus
Principal or first focus is the point from which incident rays after passing through convex lens, become parallel to the principal axis.

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Similar questions

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A ray of light after refraction through a lens emerges parallel to the principal axis of the lens. The incident ray passes through :

(a) its optical centre

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A ray of light, after refraction through a convex lens emerges parallel to the principal axis. The incident ray when produced appear to come from a point on principal axis. Name the point :

The correct option is A first focusPrincipal or first focus is the point from which incident rays after passing through convex lens, become parallel to the principal axis.

The correct option is A first focus
Principal or first focus is the point from which incident rays after passing through convex lens, become parallel to the principal axis.