Physics-
General
Easy
Question
Two point white dots are 1mm apart on a black paper. They are viewed by eye of pupil diameter 3 mm. Approximately, what is the maximum distance at which dots can be resolved by the eye ? [Take wavelength of light = 500 nm]
- 6 m
- 3 m
- 5 m
- 1 m
The correct answer is: 5 m
= 5m
Related Questions to study
Physics-
A container is filled with water (
= 1.33) upto a height of 33.25 cm. A concave mirror is placed 15 cm above the water level and the image of an object placed at the bottom is formed 25 cm below the water level. The focal length of the mirror is
A container is filled with water ( = 1.33) upto a height of 33.25 cm. A concave mirror is placed 15 cm above the water level and the image of an object placed at the bottom is formed 25 cm below the water level. The focal length of the mirror is
Physics-General
Physics-
A light source is located at 
as shown in the figure. All sides of the polygon are equal. The intensity of illumination at 
is 
. What will be the intensity of illumination at 
A light source is located at as shown in the figure. All sides of the polygon are equal. The intensity of illumination at is . What will be the intensity of illumination at
Physics-General
Physics-
The refractive index of the material of the prism and liquid are 1.56 and 1.32 respectively. What will be the value of q for the following refraction
The refractive index of the material of the prism and liquid are 1.56 and 1.32 respectively. What will be the value of q for the following refraction
Physics-General
Physics-
An isosceles prism of angle 120° has a refractive index of 1.44. Two parallel monochromatic rays enter the prism parallel to each other in air as shown. The rays emerging from the opposite faces
An isosceles prism of angle 120° has a refractive index of 1.44. Two parallel monochromatic rays enter the prism parallel to each other in air as shown. The rays emerging from the opposite faces
Physics-General
Physics-
An observer can see through a pin–hole the top end of a thin rod of height h, placed as shown in the figure. The beaker height is 3h and its radius h. When the beaker is filled with a liquid up to a height 2h, he can see the lower end of the rod. Then the refractive index of the liquid is
An observer can see through a pin–hole the top end of a thin rod of height h, placed as shown in the figure. The beaker height is 3h and its radius h. When the beaker is filled with a liquid up to a height 2h, he can see the lower end of the rod. Then the refractive index of the liquid is
Physics-General
Physics-
A rectangular glass slab ABCD, of refractive index n1, is immersed in water of refractive index n2 (n1>n2). A ray of light in incident at the surface AB of the slab as shown. The maximum value of the angle of incidence amax, such that the ray comes out only from the other surface CD is given by
A rectangular glass slab ABCD, of refractive index n1, is immersed in water of refractive index n2 (n1>n2). A ray of light in incident at the surface AB of the slab as shown. The maximum value of the angle of incidence amax, such that the ray comes out only from the other surface CD is given by
Physics-General
Physics-
A ray of light falls on the surface of a spherical glass paper weight making an angle 
with the normal and is refracted in the medium at an angle 
. The angle of deviation of the emergent ray from the direction of the incident ray
A ray of light falls on the surface of a spherical glass paper weight making an angle with the normal and is refracted in the medium at an angle . The angle of deviation of the emergent ray from the direction of the incident ray
Physics-General
Physics-
A square of side 
is placed at a distance of 
from a concave mirror of focal length 
The centre of the square is at the axis of the mirror and the plane is normal to the axis. The area enclosed by the image of the square is
A square of side is placed at a distance of from a concave mirror of focal length The centre of the square is at the axis of the mirror and the plane is normal to the axis. The area enclosed by the image of the square is
Physics-General
Physics-
Two plane mirrors. A and B are aligned parallel to each other, as shown in the figure. A light ray is incident at an angle of 
at a point just inside one end of A. The plane of incidence coincides with the plane of the figure. The maximum number of times the ray undergoes reflections (including the first one) before it emerges out is
Two plane mirrors. A and B are aligned parallel to each other, as shown in the figure. A light ray is incident at an angle of at a point just inside one end of A. The plane of incidence coincides with the plane of the figure. The maximum number of times the ray undergoes reflections (including the first one) before it emerges out is
Physics-General
Physics-
A point source of light B is placed at a distance L in front of the centre of a mirror of width d hung vertically on a wall. A man walks in front of the mirror along a line parallel to the mirror at a distance 2L from it as shown. The greatest distance over which he can see the image of the light source in the mirror is
A point source of light B is placed at a distance L in front of the centre of a mirror of width d hung vertically on a wall. A man walks in front of the mirror along a line parallel to the mirror at a distance 2L from it as shown. The greatest distance over which he can see the image of the light source in the mirror is
Physics-General
Physics-
Radius of curvature of a concave spherical surface separating air-glass medium is R. A point object is placed on the principal axis in the glass (
= 1.5). For the image to be real, seen by observer in air, distance of the object from P should be :
Radius of curvature of a concave spherical surface separating air-glass medium is R. A point object is placed on the principal axis in the glass ( = 1.5). For the image to be real, seen by observer in air, distance of the object from P should be :
Physics-General
Physics-
If an object is placed 20 cm in front of a half thin convex lens of focal length 10 cm, as shown in figure, then co-ordinate of image taking p as origin
If an object is placed 20 cm in front of a half thin convex lens of focal length 10 cm, as shown in figure, then co-ordinate of image taking p as origin
Physics-General
Physics-
The Figure shows a surface XY separating two transparent media, medium-1 and medium-2. The lines ab and cd represent wave fronts of a light wave traveling in medium-1 and incident on XY. The lines ef and gh represent wave fronts of the light wave in medium-2 after refraction.
Speed of light is
The Figure shows a surface XY separating two transparent media, medium-1 and medium-2. The lines ab and cd represent wave fronts of a light wave traveling in medium-1 and incident on XY. The lines ef and gh represent wave fronts of the light wave in medium-2 after refraction.
Speed of light is
Physics-General
Physics-
A particle is moving with a constant velocity Vm/s along the straight line shown. An observer at the end of the same line is viewing the particle. Which of the following graphs most appropriately represent the velocity of the particle as seen by the observer? All the medium boundaries are in the state of rest
A particle is moving with a constant velocity Vm/s along the straight line shown. An observer at the end of the same line is viewing the particle. Which of the following graphs most appropriately represent the velocity of the particle as seen by the observer? All the medium boundaries are in the state of rest
Physics-General
Physics-
A ray of light enters a diamond symmetrical shape (n = 2) from air and is being internally reflected near the bottom as shown in the figure. Find maximum value of angle 
possible?
A ray of light enters a diamond symmetrical shape (n = 2) from air and is being internally reflected near the bottom as shown in the figure. Find maximum value of angle possible?
Physics-General
