Final answer:
The lens capable of changing gradually from a wide angle to telephoto during a shot is called a zoom lens, thus the correct answer is option a) Zoom lens shot. Zoom lenses are versatile tools in photography used for maintaining focus and altering composition without changing the lens.
Step-by-step explanation:
The lens described in the student's question is known as a zoom lens, which means the correct answer is option a) Zoom lens shot.
A zoom lens has the capability to change its focal length gradually during a shot, allowing the camera to move from a wide angle to telephoto perspective, or vice versa, without changing the lens. This is an essential feature for photographers and videographers as it offers great flexibility in composing shots.
Advanced zoom lenses found in mirror reflex cameras provide superb image quality due to complex optics that adjust to maintain focus at varying distances.
When adjusting the focal length of a zoom lens on a camera, you're controlling the lens-to-image distance, effectively magnifying or reducing the scene before capturing the image.