Diffraction limits resolution because: MCQ with Answer and Explanation

Diffraction limits resolution because:
A. Light bends around edges, blurring images
B. Mirrors reflect poorly
C. Lenses absorb light
D. Atmosphere distorts
Answer: Option A
Solution (By JKSSB Mock Tests)
Diffraction spreads light through apertures, creating Airy patterns instead of points. Fundamental limit: θ_min ≈ 1.22λ/D (Rayleigh criterion). Memory tip: 'Diffraction limit: smaller λ or larger aperture ⇒ better resolution'. Wave optics concept frequently tested in competitive exams.

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Practice More Physics Questions

Question #1
The image formed by a plane mirror is
A. Virtual and inverted
B. Real and inverted
C. Real and erect
D. Virtual and erect

Correct Answer: Option D


Explanation:
Plane mirror forms virtual, erect, same size, laterally inverted image behind mirror. Used in periscope, looking glass. Distance behind mirror equals object distance.

This question belongs to: Science Physics
Question #2
The time taken by light to travel from Sun to Earth is approximately:
A. 8 minutes
B. 8 seconds
C. 1 day
D. 1 hour

Correct Answer: Option A


Explanation:
Average Earth-Sun distance (1 AU) ≈ 1.5×10¹¹ m. Speed of light c = 3×10⁸ m/s. Time t = distance/speed = 1.5×10¹¹ / 3×10⁸ = 500 seconds ≈ 8.33 minutes ≈ 8 minutes. This is a standard astronomical fact. Memory aid: 'Sunlight takes 8 minutes to reach Earth; we see the Sun as it was 8 minutes ago'. This factual knowledge question tests awareness of scale in physics, frequently appearing in competitive exams. Always recall key constants: Earth-Sun distance, light speed, for quick estimations.

This question belongs to: Science Physics
Question #3
Assertion (A): It is easier to pull a lawn roller than to push it. Reason (R): Pushing increases the apparent weight of the roller, thereby increasing the frictional force.
A. A is false but R is true.
B. A is true but R is false.
C. Both A and R are true but R is NOT the correct explanation of A.
D. Both A and R are true and R is the correct explanation of A.

Correct Answer: Option D


Explanation:
When you pull a roller at an upward angle, the vertical component of the applied force acts strictly upwards, reducing the normal reaction (N = mg - Fsin_theta) and thus reducing friction (muN). When you push it at a downward angle, the vertical component adds to the weight (N = mg + Fsin_theta), increasing the normal reaction and consequently increasing the rolling friction.

This question belongs to: Science Physics