Question

Concave lenses are used in cameras to focus an image of film. Is the statement true or false?
A. True.
B. False.

Answer 1

Hint: We must emphasize on properties of the concave mirror and lens respectively. The major property of the concave mirror which will be used in this question is a concave lens that always forms a virtual erect and diminished image which is suitable for the camera lens.

Complete step by step answer:
A camera needs a lens that may produce real images (images which will be obtained on the screen) of the thing on the film or screen.
A concave lens always produces virtual, erect, and diminished images. The decrease in the size of the image depends on the position of the object.
A convex lens produces real and virtual, erect and inverted, diminished same sized and magnified images depending upon the position of the object on the principal axis. For object distance beyond focus, the converging lens always produces real and enlarged images.
Hence, the correct answer is option B.

Additional Information
For this fact, we must know that the convex lens is used in the magnifying lens. For magnifying lens magnified images are required. Concave lenses are not used in the magnifying lens because concave lenses are thinner at the middle so the rays of light that pass through the lens diverge (spread out). A concave lens is a diverging lens.
The image formed is virtual and smaller (diminished).

Note:
(I)To obtain a virtual and erect image convex mirror or a diverging lens is usually used,
(II)A convex mirror may be a curved mirror during which the reflective surface bulges toward the sunshine source, such mirrors always form a virtual erect and diminished image.
(III)A concave lens may be a diverging lens. We know that when parallel rays of sunshine undergo a diverging lens the refracted rays diverge in order that they seem to return from one point called the principal focus and create a virtual and erect image.