alleryPower of a convex lens of focal length 50 cm:
- 2 D
- 0.5 D
- -2 D
- 50 D
Show answer and solution
Correct answer: A. 2 D
Power P = 1/f (in metres). f = 50 cm = 0.5 m.
P = 1/0.5 = 2 dioptre (D).
Positive sign means converging lens.
AP Intermediate 2nd Year Wave Optics — practice questions — page 2
Explore 71 free Wave Optics questions in AP Intermediate 2nd Year Physics. Open each question or exercise to read its content, reference answers and available explanation.
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Showing questions 31–60 of 71.
Power of a convex lens of focal length 50 cm:Read the answer and worked solution →Resolution limit of a telescope by Rayleigh criterion:Read the answer and worked solution →Wavelength of light in water (n = 4/3) if its vacuum wavelength is 600 nm:Read the answer and worked solution →Two coherent sources have intensities I1 = 9I and I2 = I. Maximum and minimum intensities in interference pattern:Read the answer and worked solution →Light passes from air to glass ($n = 1.5$). Brewster's angle is:Read the answer and worked solution →HUYGENS' PRINCIPLE states that every point on a wavefront acts as a:Read the answer and worked solution →In Young's double-slit experiment, the fringe width β is given by:Read the answer and worked solution →In Young's experiment, a BRIGHT fringe (constructive interference) requires path difference = ?Read the answer and worked solution →In single-slit diffraction, the central maximum is:Read the answer and worked solution →Polarisation of light is direct experimental evidence that light is a:Read the answer and worked solution →BREWSTER'S LAW for the polarising angle θ_B relates to the refractive index n as:Read the answer and worked solution →The resolving power (RP) of a diffraction grating with N slits in the m-th order is:Read the answer and worked solution →NEET · Physics · Interference or DiffractionRead the answer and worked solution →The current driven by an alternating voltage in a circuit is called:Read the answer and worked solution →The equivalent steady current giving the same average power loss is the:Read the answer and worked solution →Phase relationships between voltage and current in an ac circuit are shown using:Read the answer and worked solution →The quantity analogous to resistance for an inductor is called:Read the answer and worked solution →The opposition offered by a capacitor to alternating current is called:Read the answer and worked solution →What is the SI unit of inductive reactance?Read the answer and worked solution →In a purely resistive ac circuit, the voltage and the current are:Read the answer and worked solution →In a circuit containing an inductor, the current does what relative to the voltage?Read the answer and worked solution →In a circuit containing a capacitor, the current does what relative to the voltage?Read the answer and worked solution →At the resonant frequency of a series RLC circuit, the current amplitude is:Read the answer and worked solution →A current that flows while no power is dissipated is sometimes called a:Read the answer and worked solution →Why is ac voltage preferred over dc voltage for power distribution?Read the answer and worked solution →The household line voltage of 220 V is quoted as which kind of value?Read the answer and worked solution →A well designed transformer may reach an efficiency of more than:Read the answer and worked solution →Which transformer loss arises from currents induced in the iron core itself?Read the answer and worked solution →Which transformer loss arises from repeatedly reversing the magnetisation of the core?Read the answer and worked solution →Inductor against capacitorRead the answer and worked solution →
Worked practice questions
Resolution limit of a telescope by Rayleigh criterion:
- θ = λ/d
- θ = 1.22 λ/d (d = aperture)
- θ = λ²/d
- θ = d/λ
Show answer and solution
Correct answer: B. θ = 1.22 λ/d (d = aperture)
Two point sources are just resolved when angular separation θ = 1.22 λ/d.
Larger aperture gives better resolution.
Same formula applies to a circular aperture telescope.
Wavelength of light in water (n = 4/3) if its vacuum wavelength is 600 nm:
- 450 nm
- 600 nm
- 800 nm
- 900 nm
Show answer and solution
Correct answer: A. 450 nm
λ_medium = λ_vacuum / n = 600/(4/3) = 600 × 3/4 = 450 nm.
Frequency stays the same; wavelength shrinks in denser media.
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