Complete the following sentences:(a) If half part of a convex lens is

1.	Complete the following sentences:(a) If half part of a convex lens is covered, the focal length ……………… change, but the intensity of image ……………….(b) A convex lens is placed in water. Its focal length will ……………………….(c) The focal length of a then convex lens is …………….. than that of a thick convex lens.
Answer» (a) If half part of a convex lens is covered, the focal length does not change, but the intensity of image decreases. (b) A convex lens is placed in water. Its focal length will increase. (c) The focal length of a thin convex lens is more than that of a thick convex lens.

Complete the following sentences:(a) If half part of a convex lens is covered, the focal length ……………… change, but the intensity of image ……………….(b) A convex lens is placed in water. Its focal length will ……………………….(c) The focal length of a then convex lens is …………….. than that of a thick convex lens.

Answer»

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

(b) A convex lens is placed in water. Its focal length will increase.