Wave Optics: Interference

Coherence, YDSE, and fringe basics. Ideal for students preparing board exams and competitive tests.

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QUESTION NO 01

Total internal reflection occurs when light goes from?

Answer: Denser to rarer medium beyond critical angle

TIR: denser → rarer with i > critical angle.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 02

Critical angle for glass–air is typically around?

Answer: 42°

For n ≈ 1.5 glass to air, c ≈ arcsin(1/1.5) ≈ 42°.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 03

Dispersion by a prism is due to?

Answer: Wavelength-dependent refractive index

n varies with wavelength, so colours separate.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 04

Primary rainbow is caused by?

Answer: Refraction and reflection in raindrops

Rainbows involve refraction, dispersion, and internal reflection in water drops.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 05

Power of a lens (in dioptres) is?

Answer: 1/f with f in metres

P(D) = 1/f(m).

Shahzad Mahota @shahzad-mahota

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QUESTION NO 06

Myopia is corrected by?

Answer: Concave lens

Nearsightedness is corrected with diverging (concave) lenses.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 07

Hypermetropia is corrected by?

Answer: Convex lens

Farsightedness is corrected with converging (convex) lenses.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 08

Interference requires?

Answer: Coherent sources

Stable interference patterns need coherent waves.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 09

Young's double-slit fringe width is?

Answer: λD/d

β = λD/d for YDSE.

Shahzad Mahota @shahzad-mahota

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QUESTION NO 10

Diffraction is more noticeable when obstacle size is?

Answer: Comparable to wavelength

Wave effects like diffraction are significant when sizes ~ λ.

Shahzad Mahota @shahzad-mahota

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Wave Optics: Interference

Total internal reflection occurs when light goes from?

Critical angle for glass–air is typically around?

Dispersion by a prism is due to?

Primary rainbow is caused by?

Power of a lens (in dioptres) is?

Myopia is corrected by?

Hypermetropia is corrected by?

Interference requires?

Young's double-slit fringe width is?

Diffraction is more noticeable when obstacle size is?

Published By

Shahzad Mahota

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00

00

00

00

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Wave Optics: Interference

Total internal reflection occurs when light goes from?

Explanation

Critical angle for glass–air is typically around?

Explanation

Dispersion by a prism is due to?

Explanation

Primary rainbow is caused by?

Explanation

Power of a lens (in dioptres) is?

Explanation

Myopia is corrected by?

Explanation

Hypermetropia is corrected by?

Explanation

Interference requires?

Explanation

Young's double-slit fringe width is?

Explanation

Diffraction is more noticeable when obstacle size is?

Explanation

Published By

Shahzad Mahota

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00

00

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