Question

If a part of a convex lens is covered its focal length will

Answer 1

You will get the image of a distant object on the focal point just like a normal uncovered lens. The image will be only half as bright as compared to that with uncovered lens....
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Answer 2

Explanation:

1.A convex lens can produce the complete image of the object even though half of the lens is covered .

Because light rays coming from the object can be refracted from

If half part of a convex lens is covered, the focal length change, but ... Hence, If half part of a convex lens is covered, the focal length does not change, but the intensity of the image decreases.