Physics-
General
Easy
Question
The slab of a material of refractive index 2 shown in figure has curved surface APB of radius of curvature 10 cm and a plane surface CD. On the left of APB is air and on the right of CD is water with refractive indices as given in figure. An object O is placed at a distance of 15 cm from pole P as shown. The distance of the final image of O from P, as viewed from the left is
- 20 cm
- 30 cm
- 40 cm
- 50 cm
The correct answer is: 30 cm
In case of refraction from a curved surface, we have
Þ
Þv =– 30 cm.
i.e. the curved surface will form virtual image I at distance of 30 cm from P. Since the image is virtual there will be no refraction at the plane surface CD (as the rays are not actually passing through the boundary), the distance of final image I from P will remain 30 cm
Related Questions to study
Physics-
A rod of glass (
= 1.5) and of square cross section is bent into the shape shown in the figure. A parallel beam of light falls on the plane flat surface A as shown in the figure. If d is the width of a side and R is the radius of circular arc then for what maximum value of 
light entering the glass slab through surface A emerges from the glass through B
A rod of glass ( = 1.5) and of square cross section is bent into the shape shown in the figure. A parallel beam of light falls on the plane flat surface A as shown in the figure. If d is the width of a side and R is the radius of circular arc then for what maximum value of light entering the glass slab through surface A emerges from the glass through B
Physics-General
Physics-
An optical fibre consists of core of 
surrounded by a cladding of 
. A beam of light enters from air at an angle 
with axis of fibre. The highest for which ray can be travelled through fibre is
An optical fibre consists of core of surrounded by a cladding of . A beam of light enters from air at an angle with axis of fibre. The highest for which ray can be travelled through fibre is
Physics-General
Physics-
A prism having an apex angle 4o and refraction index 1.5 is located in front of a vertical plane mirror as shown in figure. Through what total angle is the ray deviated after reflection from the mirror
A prism having an apex angle 4o and refraction index 1.5 is located in front of a vertical plane mirror as shown in figure. Through what total angle is the ray deviated after reflection from the mirror
Physics-General
Physics-
A fish rising vertically up towards the surface of water with speed 3 ms–1 observes a bird diving vertically down towards it with speed 9 ms–1. The actual velocity of bird is
A fish rising vertically up towards the surface of water with speed 3 ms–1 observes a bird diving vertically down towards it with speed 9 ms–1. The actual velocity of bird is
Physics-General
Physics-
The image of point P when viewed from top of the slabs will be
The image of point P when viewed from top of the slabs will be
Physics-General
Physics-
A cube of side 2 m is placed in front of a concave mirror focal length 1m with its face P at a distance of 3 m and face Q at a distance of 5 m from the mirror. The distance between the images of face P and Q and height of images of P and Q are
A cube of side 2 m is placed in front of a concave mirror focal length 1m with its face P at a distance of 3 m and face Q at a distance of 5 m from the mirror. The distance between the images of face P and Q and height of images of P and Q are
Physics-General
Physics-
Two transparent slabs have the same thickness as shown. One is made of material A of refractive index 1.5. The other is made of two materials B and C with thickness in the ratio 1 : 2. The refractive index of C is 1.6. If a monochromatic parallel beam passing through the slabs has the same number of waves inside both, the refractive index of B is
Two transparent slabs have the same thickness as shown. One is made of material A of refractive index 1.5. The other is made of two materials B and C with thickness in the ratio 1 : 2. The refractive index of C is 1.6. If a monochromatic parallel beam passing through the slabs has the same number of waves inside both, the refractive index of B is
Physics-General
Physics-
Consider the situation shown in figure. Water 
is filled in a breaker upto a height of 10 cm. A plane mirror fixed at a height of 5 cm from the surface of water. Distance of image from the mirror after reflection from it of an object O at the bottom of the beaker is
Consider the situation shown in figure. Water is filled in a breaker upto a height of 10 cm. A plane mirror fixed at a height of 5 cm from the surface of water. Distance of image from the mirror after reflection from it of an object O at the bottom of the beaker is
Physics-General
Physics-
One side of a glass slab is silvered as shown. A ray of light is incident on the other side at angle of incidence 
Refractive index of glass is given as 1.5. The deviation of the ray of light from its initial path when it comes out of the slab is
One side of a glass slab is silvered as shown. A ray of light is incident on the other side at angle of incidence Refractive index of glass is given as 1.5. The deviation of the ray of light from its initial path when it comes out of the slab is
Physics-General
Physics-
A plane mirror is placed at the bottom of the tank containing a liquid of refractive index . P is a small object at a height h above the mirror. An observer O-vertically above P outside the liquid see P and its image in the mirror. The apparent distance between these two will be
A plane mirror is placed at the bottom of the tank containing a liquid of refractive index . P is a small object at a height h above the mirror. An observer O-vertically above P outside the liquid see P and its image in the mirror. The apparent distance between these two will be
Physics-General
Physics-
If an object moves towards a plane mirror with a speed v at an angle 
to the perpendicular to the plane of the mirror, find the relative velocity between the object and the image
If an object moves towards a plane mirror with a speed v at an angle to the perpendicular to the plane of the mirror, find the relative velocity between the object and the image
Physics-General
Physics-
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]
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]
Physics-General
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
