Free NEET Physics multiple-choice questions on Diffraction & Polarization. Attempt each question and reveal the answer with a full explanation.
The sky appears blue because of: Rayleigh scattering Mie scattering Dispersion Total internal reflection Three polarizers are placed such that the first and the third are crossed. The pass axis of the second polarizer is inclined at 45 to the first. If unpolarized light of intensity I 0 is incident on the first polarizer, the intensity of light emerging from the third polarizer is: I 0 / 8 I 0 / 4 I 0 / 16 I 0 / 2 The Fresnel distance for an aperture of 3 mm and wavelength 600 nm is: 15 m 1.5 m 150 m 0.15 m Clouds appear white because of: Mie scattering Rayleigh scattering Refraction Diffraction In a single slit diffraction experiment, the width of the slit is made double its original width. How does this affect the size and intensity of the central diffraction band? Size reduces to half, intensity increases fourfold Size doubles, intensity increases fourfold Size reduces to half, intensity doubles Size doubles, intensity reduces to half In a diffraction pattern due to a single slit of width a , the first minimum is observed at an angle 30 when light of wavelength 5000 is incident on the slit. The first secondary maximum is observed at an angle of: -1 (3/4) -1 (1/4) -1 (2/3) -1 (1/2) Light with an energy flux of 18 W/cm 2 falls on a non-reflecting surface at normal incidence. If the surface has an area of 20 cm 2 , the average force exerted on the surface during a 30-minute time span is: 1.2 10 -6 N 2.4 10 -6 N 4.8 10 -6 N 1.2 10 -4 N When a celestial body like a star moves away from the earth, the spectral lines are shifted towards the red end. This is known as: Redshift Blueshift Zeeman effect Raman effect The yellow color of the sun at sunset is primarily due to: Rayleigh scattering Dispersion of light Refraction in the atmosphere Total internal reflection Which of the following is responsible for the 'sparkling' of a diamond? High refractive index leading to small critical angle Large angle of the prism Polarization of light Diffraction of light In a single slit diffraction experiment, if the distance between the slit and the screen is doubled, the width of the central maximum will: Double Halve Remain same Become four times Unpolarized light of intensity I 0 is incident on a polarizer. The light transmitted through it then passes through a second polarizer whose axis is inclined at 60 to the first. The intensity of light emerging from the second polarizer is: I 0 / 8 I 0 / 4 I 0 / 2 3I 0 / 8 An unpolarized beam of light of intensity I 0 falls on a system of two polarizers. The first polarizer is rotated by 30 o and the second is rotated by 60 o with respect to the vertical. The intensity of the transmitted light is: (3/8)I 0 (1/8)I 0 (1/4)I 0 (3/4)I 0 In a single slit diffraction experiment, the first minimum of the diffraction pattern for a light of wavelength λ 1 = 600 nm coincides with the first maximum of wavelength λ 2 . The value of λ 2 is: 400 nm 450 nm 300 nm 900 nm The angular width of the central maximum in a single slit diffraction pattern is 60 . The slit width is a and the light used has wavelength . Then: a = a = 2 a = /2 a = 3