How does the image distance (di) of a convex lens compare with the image distance of a concave lens? a. the image distance of the convex lens is positive, and that of the concave lens is negative. b. both are negative for a virtual image. c. both are positive for a virtual image d. the image distance of the convex lens is negative, and that of the concave lens is positive.
Image distance of a mirror is defined as the distance between the optical center and the formed image.
The image formed by a concave lens is virtual always. We can say that the image distance for a concave lens is negative. The convex lens or the converging lens can form both real and virtual images. So, the image distance for a convex lens can be either positive or negative. Generally, the image distance for convex lens is positive.
So, the correct option is (a) " The image distance of the convex lens is positive, and that of the concave lens is negative ".
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The convex lens is a lens that converges rays of light that convey parallel to its principal axis (i.e. converges the incident rays towards the principal axis) which is relatively thick across the middle and thin at the lower and upper edges. The edges are curved outward rather than inward.
The correct answer to the question is - A convex lens converges light and curves outward.
Before going to answer this question, first we have to understand a convex lens.
A convex lens is a type of optically transparent spherical lens in which the middle part is bulged outward and thinner at the edges.
The convex lens is considered as converging lens. It is so because the rays moving parallel to the principal axis gets focused or converged at a point on the principal axis after being refracted through this lens. This point is known as the focal point of the lens.
On the other hand the concave lens is diverging in nature. It is thinner at the middle and thicker at the edges.
Hence, the correct answer out of four options given in the question will be - A convex lens converges light and curves outward.