1. The phenomenon in which light deviates from its path due to the change in medium is called:
Answer:
Explanation:
Refraction occurs when light passes from one medium to another, changing its direction due to a change in speed.
2. A concave mirror produces a real and inverted image. The object is placed:
Answer:
Explanation:
When an object is placed beyond the center of curvature of a concave mirror, it produces a real and inverted image between the center of curvature and the focus.
3. Which lens forms a virtual and erect image for all positions of the object?
Answer:
Explanation:
A concave lens always forms a virtual and erect image, irrespective of the object's position.
4. The splitting of white light into its constituent colors is known as:
Answer:
Explanation:
Dispersion refers to the splitting of white light into its different color components due to varying refraction angles for different wavelengths.
5. The point on the lens axis where all parallel rays either converge or appear to diverge is called the:
Answer:
Explanation:
Focus is the point where parallel rays of light either converge (in convex lens) or appear to diverge (in concave lens) after passing through the lens.
6. The lens which has one flat surface and one curved surface is called:
Answer:
Explanation:
A plano-convex lens has one flat (plane) and one outwardly curved (convex) surface.
7. The phenomenon of bending of light around the corners of an obstacle or aperture is:
Answer:
Explanation:
Diffraction is the bending of light waves around the corners of an obstacle or aperture.
8. The mirror used by dentists to see the enlarged image of teeth is:
Answer:
Explanation:
Concave mirrors can produce enlarged images, which helps dentists in closely examining the teeth.
9. Which of the following lenses can correct myopia?
Answer:
Explanation:
Myopia or nearsightedness is corrected using a concave lens.
10. The phenomenon in which light does not pass through an object and bounces back is:
Answer:
Explanation:
Reflection occurs when light bounces back from a surface without passing through it.
11. The phenomenon due to which an object submerged in a liquid appears to be raised is called:
Answer:
Explanation:
This phenomenon is due to the refraction of light as it passes from the liquid to air.
12. The distance between the optical center of a lens and its focus is called:
Answer:
Explanation:
Focal length is the distance between the focus and the optical center of a lens.
13. The phenomenon due to which the path of light changes in a denser medium is:
Answer:
Explanation:
Total internal reflection occurs when light reflects within a denser medium and does not pass through the boundary to the rarer medium.
14. The mirror used in automobiles to see traffic behind is:
Answer:
Explanation:
Convex mirrors provide a wider field of view, making them suitable for vehicles.
15. Which of the following is not an optical instrument?
Answer:
Explanation:
A stethoscope is an instrument used to hear internal sounds in the human body, and it doesn't involve optics.