A person wants a real image of his own, 3 times enlarged. Where should he stand
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?
Options
(a) 90 cm (b) […]
Physics
Calculate the focal length of a reading glass of a person, if the distance
Calculate the focal length of a reading glass of a person, if the distance of distinct vision is 75 cm
Options
(a) 75.2 cm (b) 25.6 cm (c) 100.4 cm (d) 37.5 cm
Correct […]
Dispersion of light is caused due to
Dispersion of light is caused due to
Options
(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
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
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:
Options
(a) I₁ + […]
The focal lengths of a converging lens are fᵥ and fᵣ for violet and red lights
The focal lengths of a converging lens are fᵥ and fᵣ for violet and red lights, respectively. Which of the following is correct?
Options
(a) fᵥ < fᵣ (b) fᵥ = fᵣ (c) […]
A ray of light passes from a medium A having refractive index 1.6 to the medium
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……..
Options
(a) sin⁻¹ √16/15 […]
Angle of minimum deviation for a prism of reractive index 1.5 equal to the angle
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)
Options
(a) 80⁰ […]
The near point and far point of a person are 40 cm and 250 cm, respectively.
The near point and far point of a person are 40 cm and 250 cm, respectively. Determine the power of the lens he/she should use while reading a book kept at distance 25 cm from […]
The angle of incidence for a ray of light at a refracting surface of a prism is 45⁰.
The angle of incidence for a ray of light at a refracting surface of a prism is 45⁰. The angle of prism is 60⁰. If the ray suffers minimum deviation through the prism, then the […]