A parallel beam of light of wavelength λ is incident normally on a narrow slit. A diffraction pattern is formed on a screen placed perpendicular to the direction of the incident beam. At the second […]
In Young’s double slit experiment the distance between the slits and the screen is doubled. The separation between the slits is reduces to half. As a result the fringe width
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(a) is […]
A person wants a real image of his own, 3 times enlarged. Where should he stand in front of a concave mirror of radius of curvature of 30 cm?
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(a) 90 cm (b) […]
Calculate the focal length of a reading glass of a person, if the distance of distinct vision is 75 cm
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(a) 75.2 cm (b) 25.6 cm (c) 100.4 cm (d) 37.5 cm
Correct […]
Dispersion of light is caused due to
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(a) intensity of light (b) density of medium (c) wavelength (d) None of the above
Correct Answer:
wavelength
Explanation:
The spliting of white light into its […]
A lens having focal length f and aperture of diameter d forms an image of intensity I. Aperature of diameter d/2 in central region of lens is covered by a black paper. Focal length of […]
The periodic waves of intensities I₁ and I₂ pass through a region at the same time in the same direction. The sum of the maximum and minimum intensities is:
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(a) I₁ + […]
The focal lengths of a converging lens are fᵥ and fᵣ for violet and red lights, respectively. Which of the following is correct?
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(a) fᵥ < fᵣ (b) fᵥ = fᵣ (c) […]
A ray of light passes from a medium A having refractive index 1.6 to the medium B having refractive index 1.5. The value of critical angle of medium A is……..
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(a) sin⁻¹ √16/15 […]
Angle of minimum deviation for a prism of reractive index 1.5 equal to the angle of prism of given prism. Then, the angle of prism is ……. (sin 48⁰36′ =0.75)
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(a) 80⁰ […]
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