Light and Optical Instruments (Lenses, Mirrors) MCQs

1. Which of the following is the correct definition of refraction?
(A) The bending of light as it passes through a medium
(B) The bending of light as it strikes a surface
(C) The reflection of light from a smooth surface
(D) The change in the direction of light due to a change in its speed

2. A concave mirror converges light rays to a:
(A) Focal point in front of the mirror
(B) Focal point behind the mirror
(C) Line parallel to the mirror
(D) Point on the mirror’s surface

3. Which type of lens is thicker in the middle than at the edges?
(A) Convex lens
(B) Concave lens
(C) Plano-convex lens
(D) Cylindrical lens

4. The focal length of a convex lens is:
(A) Negative
(B) Positive
(C) Zero
(D) Infinite

5. In a concave mirror, the image formed when an object is placed beyond the focal point is:
(A) Virtual and upright
(B) Virtual and inverted
(C) Real and inverted
(D) Real and upright

6. Which of the following statements about a convex lens is correct?
(A) It diverges parallel rays of light
(B) It converges parallel rays of light
(C) It produces only virtual images
(D) It has a negative focal length

7. The image formed by a concave lens is always:
(A) Real and inverted
(B) Real and upright
(C) Virtual and upright
(D) Virtual and inverted

8. The primary use of a concave mirror is in:
(A) Flashlights
(B) Telescopes
(C) Magnifying glasses
(D) Cameras

9. In a simple microscope, which type of lens is used?
(A) Concave lens
(B) Convex lens
(C) Plane mirror
(D) Concave mirror

10. When light passes through a prism, it:
(A) Refracts but does not reflect
(B) Is absorbed and not transmitted
(C) Refracts and disperses into its component colors
(D) Does not change direction