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A camera is an optical instrument which makes use of an
A) Convex lens
B) Concave lens
C) Cylinder lens
D) Planar lens

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Answer
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Hint: A camera is an instrument that is used to record images. It has a small hole called an aperture that allows light rays to enter and helps capture the image. Cameras have lenses fitted in them to change the intensity of the light entering the hole. Aperture can be widened or narrowed to vary the intensity of the rays.

Complete step by step answer:
The main objective of the camera is to focus all the light rays at one point so that a clear and bright image of the object can be formed. Since a convex lens is also called a converging lens, therefore a convex lens is used in a camera.

The light rays fall on the lens of the camera and then get focused at one point. This results in the formation of a sharp image.

A camera is an optical instrument that makes use of a convex lens. Hence, option A is the right answer.

Note:
It is to be noted that though a convex lens is used as a camera lens, the concave lens is also of great importance and hence used in the camera. The first lens of the camera is a convex lens and after that, there is a concave lens. This is because when a convex lens is used alone, it will refract the light of different colors from different angles. This will result in an unclear picture. So a concave lens is used because the center of a concave lens is thinner than its edges. When light falls, then the rays bend outwards and diverge away from each other.