asin30=λ
asinθ=23λ
sin30sinθ=23
sinθ=23×21
sinθ=43
θ=sin(43)
In a diffraction pattern due to a single slit of width a the first minimum is observed at an angle 30o when light of wavelength 5000Å is incident on the slit. The first secondary maximum is observed at an angle of:
Held on 30 Apr 2016 · Verified 9 Jul 2026.
sin−1(41)
sin−1(32)
sin−1(21)
sin−1(43)
Sign in to track your attempts and accuracy.
Sign in to keep a private note on this question. Nothing you write is ever public.
The refractive index of glass is 1.5. The speed of light in glass is:
Two thin lenses of focal lengths f₁ = +20 cm and f₂ = -10 cm are in contact. The power of the combination is:
An unpolarized light beam travelling in air is incident on a medium of refractive index 1.73 at Brewster's angle. Then -
A microscope has an objective of focal length 2 cm , eyepiece of focal length 4 cm and the tube length of 40 cm . If the distance of distinct vision of eye is 25 cm , the magnification in the microscope is :
The intensity of transmitted light when a polaroid sheet, placed between two crossed polaroids at $22.5^{\circ}$ from the polarization axis of one of the polaroid, is ( $\mathrm{I}_0$ is the intensity of polarised light after passing through the first polaroid):
Work through every NEET UG Optics PYQ, year by year.