Question

Assertion (A) : A convex lens have a real focus

Reason (R) : A convex lens converges a beam of light parallel to the principal axis.​

Answer 1

Answer:

Both Assertion and the reason are incorrect

Answer 2

Both assertion and reason are true, and the assertion is the correct explanation of the reason.

• The convex lens is said to be having a real focus because it converges the beam of light to light parallel to the principal axis.
• The focus of any lens is said to be real when the image is obtained at the focus of the lens, the image would be real. The size of the image will be smaller than that of the object.
• A convex lens always converges the beam of light toward the principal axis. This is so because the curve of the lens is outward, and when the beam of light passes through the lens, it refracts the light and hence the light gets converged, and so a convex lens is often known as a converging lens.
• Therefore, both assertion and reason are true, and the reason is the correct explanation of the assertion.