Optics CDS Questions

CDS Physics

Optics MCQ Questions


7.
When an object is placed exactly at the centre of curvature of a concave mirror, the image formed will be:
A.
Real, erect, and magnified
B.
Virtual, erect, and diminished
C.
Real, inverted, and of the same size as the object
D.
Virtual, inverted, and of the same size
πŸ˜‘ View Answer Rough Work Error
ANSWER :
C. Real, inverted, and of the same size as the object
8.
Why is a convex mirror commonly used as a rear-view (side) mirror in vehicles, rather than a plane or concave mirror?
A.
A convex mirror forms only real, inverted images, useful for safety warnings
B.
A convex mirror magnifies the image significantly, making distant objects appear much closer than they are
C.
A convex mirror cannot form any image at all, making it purely decorative
D.
A convex mirror provides a wider field of view (covers a larger area behind the vehicle) and always forms a diminished, erect image
πŸ˜‘ View Answer Rough Work Error
ANSWER :
D. A convex mirror provides a wider field of view (covers a larger area behind the vehicle) and always forms a diminished, erect image
9.
For a given focal length, which type of concave mirror generally produces a sharper image, free from significant spherical aberration?
A.
A concave mirror with a larger aperture
B.
Aperture size has no effect whatsoever on image sharpness
C.
A concave mirror with a smaller aperture (opening)
D.
Only convex mirrors are free from spherical aberration
πŸ˜‘ View Answer Rough Work Error
ANSWER :
C. A concave mirror with a smaller aperture (opening)
10.
Refraction of light refers to the phenomenon in which light:
A.
Bounces back entirely from a surface without entering the second medium
B.
Splits into its constituent colours upon striking any surface
C.
Is completely absorbed by the medium it enters
D.
Changes direction (bends) as it passes from one transparent medium into another, due to a change in its speed
πŸ˜‘ View Answer Rough Work Error
ANSWER :
D. Changes direction (bends) as it passes from one transparent medium into another, due to a change in its speed
11.
The fundamental cause of refraction, at the level of physical mechanism, is:
A.
The complete absorption and re-emission of light by the new medium
B.
An external magnetic field acting on the light ray
C.
The change in the speed of light as it passes from one medium to another
D.
A change in the colour (wavelength) of the light itself
πŸ˜‘ View Answer Rough Work Error
ANSWER :
C. The change in the speed of light as it passes from one medium to another
12.
Snell's Law of refraction is mathematically expressed as:
A.
n₁ sin θ₁ = nβ‚‚ sin ΞΈβ‚‚
B.
n₁ cos θ₁ = nβ‚‚ cos ΞΈβ‚‚
C.
n₁/sin θ₁ = nβ‚‚/sin ΞΈβ‚‚
D.
n₁ + sin θ₁ = nβ‚‚ + sin ΞΈβ‚‚
πŸ˜‘ View Answer Rough Work Error
ANSWER :
A. n₁ sin θ₁ = nβ‚‚ sin ΞΈβ‚‚