Question 1:
Which formula relates the object distance (do), image distance (di), and focal length (f) of a thin lens?
Explanation: The correct answer is C) Thin lens formula. The thin lens formula relates the object distance (do), image distance (di), and focal length (f) of a thin lens. It is given by 1/f = 1/do + 1/di, where f is the focal length, do is the object distance, and di is the image distance.
Question 2:
In the lens equation, a positive value for the image distance (di) indicates:
Explanation: The correct answer is A) A real image. In the lens equation, a positive value for the image distance (di) indicates that the image formed by the lens is real. A real image can be projected onto a screen and is formed when light rays actually converge at a point after passing through the lens.
Question 3:
In the lens equation, a negative value for the image distance (di) indicates:
Explanation: The correct answer is B) A virtual image. In the lens equation, a negative value for the image distance (di) indicates that the image formed by the lens is virtual. A virtual image cannot be projected onto a screen and is formed when light rays appear to diverge from a point behind the lens.
Question 4:
In the thin lens formula, a positive value for the focal length (f) indicates:
Explanation: The correct answer is A) A converging lens. In the thin lens formula, a positive value for the focal length (f) indicates that the lens is a converging lens. A converging lens brings parallel light rays to a focus and can form both real and virtual images depending on the object position.
Question 5:
In the thin lens formula, a negative value for the focal length (f) indicates:
Explanation: The correct answer is B) A diverging lens. In the thin lens formula, a negative value for the focal length (f) indicates that the lens is a diverging lens. A diverging lens causeslight rays to diverge and cannot bring parallel light rays to a focus. It forms only virtual and diminished images.