Physics-
General
Easy
Question
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
- 5/2
- 3/2
The correct answer is:
Related Questions to study
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
Physics-
A horizontal ray of light passes through a prism of 
whose apex angle is 
and then strikes a vertical mirror M as shown in figure. For the ray after reflection to become horizontal, the mirror must be rotated through an angle of
A horizontal ray of light passes through a prism of whose apex angle is and then strikes a vertical mirror M as shown in figure. For the ray after reflection to become horizontal, the mirror must be rotated through an angle of
Physics-General
Physics-
A light beam is traveling from region(1) to region (4) as shown in figure. The refractive in dices of regions (1),(2),(3) and (4) are 
,
, 
, 
respectively. The angle of incidence for which the beam just misses entering region (4) is:
A light beam is traveling from region(1) to region (4) as shown in figure. The refractive in dices of regions (1),(2),(3) and (4) are ,, , respectively. The angle of incidence for which the beam just misses entering region (4) is:
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 figure. The beakers height is 3h and its radius 2h, when the beaker is filled with a liquid upto a height 2h, he can see the lower end of the rod, 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 figure. The beakers height is 3h and its radius 2h, when the beaker is filled with a liquid upto a height 2h, he can see the lower end of the rod, The refractive index of the liquid is:
Physics-General
Physics-
Assertion : A laser beam 0.2 W power can drill holes through a metal sheet, whereas 1000 W torch-light cannot.
Reason : The frequency of laser light is much higher then that of torch light.
Assertion : A laser beam 0.2 W power can drill holes through a metal sheet, whereas 1000 W torch-light cannot.
Reason : The frequency of laser light is much higher then that of torch light.
Physics-General
Physics-
Assertion : If three identical bulbs are connected in series as shown in figure then on closing the switches. Bulb C short circuited and hence illumination of bulbs A and B decreases.
Reason : Voltage on A and B decreases
Assertion : If three identical bulbs are connected in series as shown in figure then on closing the switches. Bulb C short circuited and hence illumination of bulbs A and B decreases.
Reason : Voltage on A and B decreases
Physics-General
