Question

When red,blue and green light coming parallel to principal axis fall on a convex lens,they will converge at what point?

Answer 1

Answer:

they will converse on principal axis at one point.

Explanation:

Answer 2

The right answer is the Principal focus.

• The principal focus is the location where parallel light rays converge after passing through the convex lens.
• The principal focus is situated half the radius of curvature away from the optical centre.

• A location on the principal axis known as the principal focus is where parallel incident rays come together after reflecting or refracting in mirrors (in lenses).
• It is a fixed point of a specific lens or mirror and is determined by its shape.
• The focal length of the lens or mirror is also determined by the principal focus.

• we can say, f= R/2(paraxial rays) , R is the radius of curvature.
• Parallel light beams that strike a convex lens converge as they pass through and converge at a point on the other side.
• Because of this, the convex lens is also referred to as a converging lens.

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