Physics-
General
Easy
Question
The radius of curvature of the left and right surface of the concave lens are 10cm and 15cm respectively. The radius of curvature of the mirror is 15cm
- equivalent focal length of the combination is -18cm
- equivalent focal length of the combination is +36cm
- the system behaves like a concave mirror
- the system behaves like a convex mirror
The correct answer is: equivalent focal length of the combination is -18cm
Related Questions to study
physics-
An object O is kept infront of a converging lens of focal length 30cm behind which there is a plane mirror at 15cm from the lens
An object O is kept infront of a converging lens of focal length 30cm behind which there is a plane mirror at 15cm from the lens
physics-General
physics-
A diminished image of an object is to be obtained on a large screen 1 m from it. This can be achieved by
A diminished image of an object is to be obtained on a large screen 1 m from it. This can be achieved by
physics-General
physics-
A curved surface of radius R separates two medium of refractive indices 
and 
2 as shown in figures A and B Identify the correct statement(s) related to the formation of images of a real object O placed at x from the pole of the concave surface, as shown in figure B
A curved surface of radius R separates two medium of refractive indices and 2 as shown in figures A and B Identify the correct statement(s) related to the formation of images of a real object O placed at x from the pole of the concave surface, as shown in figure B
physics-General
physics-
A curved surface of radius R separates two medium of refractive indices and as shown in figures A and B Choose the correct statement(s) related to the virtual image formed by object O placed at a distance x, as shown in figure A
A curved surface of radius R separates two medium of refractive indices and as shown in figures A and B Choose the correct statement(s) related to the virtual image formed by object O placed at a distance x, as shown in figure A
physics-General
physics-
A curved surface of radius R separates two medium of refractive indices and as shown in figures A and B Choose the correct statement(s) related to the real image formed by the object O placed at a distance x, as shown in figure A
A curved surface of radius R separates two medium of refractive indices and as shown in figures A and B Choose the correct statement(s) related to the real image formed by the object O placed at a distance x, as shown in figure A
physics-General
physics-
Two refracting media are separated by a spherical interface as shown in the figure. PP’ is the principal axis, m1 and m2 are the refractive indices of medium of incidence and medium of refraction respectively. Then :
Two refracting media are separated by a spherical interface as shown in the figure. PP’ is the principal axis, m1 and m2 are the refractive indices of medium of incidence and medium of refraction respectively. Then :
physics-General
physics-
In the figure shown a point object O is placed in air on the principal axis. The radius of curvature of the spherical surface is 60 cm. If is the final image formed after all the refractions and reflections
In the figure shown a point object O is placed in air on the principal axis. The radius of curvature of the spherical surface is 60 cm. If is the final image formed after all the refractions and reflections
physics-General
physics-
In the diagram shown, a ray of light is incident on the interface between 1 and 2 at angle slightly greater than critical angle. The light suffers total internal reflection at this interface. After that the light ray falls at the interface of 1 and 3, and again it suffers total internal reflection. Which of the following relations should hold true?
In the diagram shown, a ray of light is incident on the interface between 1 and 2 at angle slightly greater than critical angle. The light suffers total internal reflection at this interface. After that the light ray falls at the interface of 1 and 3, and again it suffers total internal reflection. Which of the following relations should hold true?
physics-General
physics-
The figure shows a ray incident at an angle i = 
/3. If the plot drawn shown the variation of | r – i | versus 
The figure shows a ray incident at an angle i = /3. If the plot drawn shown the variation of | r – i | versus
physics-General
physics-
A ray of light is incident normally on one face of 30° – 60° – 90° prism of refractive index 5/3 immersed in water of refractive index 4/3 as shown in figure
A ray of light is incident normally on one face of 30° – 60° – 90° prism of refractive index 5/3 immersed in water of refractive index 4/3 as shown in figure
physics-General
physics-
In the figure shown consider the first reflection at the plane mirror and second at the convex mirror. AB is object
In the figure shown consider the first reflection at the plane mirror and second at the convex mirror. AB is object
physics-General
physics-
A flat mirror M is arranged parallel to a wall W at a distance l from it. The light produced by a point source S kept on the wall is reflected by the mirror and produces a light spot on the wall. The mirror moves with velocity v towards the wall
A flat mirror M is arranged parallel to a wall W at a distance l from it. The light produced by a point source S kept on the wall is reflected by the mirror and produces a light spot on the wall. The mirror moves with velocity v towards the wall
physics-General
physics-
Two plane mirrors at an angle such that a ray incident on a mirror undergoes a total deviation of 240° after two reflections
Two plane mirrors at an angle such that a ray incident on a mirror undergoes a total deviation of 240° after two reflections
physics-General
physics-
A ray of light is incident normally on a prism of refractive index 1.5, as shown. The prism is immersed in a liquid of refractive index 
. The largest value of the angle ACB, so that the ray is totally reflected at the face AC, is 30°. Then the value of m must be :
A ray of light is incident normally on a prism of refractive index 1.5, as shown. The prism is immersed in a liquid of refractive index . The largest value of the angle ACB, so that the ray is totally reflected at the face AC, is 30°. Then the value of m must be :
physics-General
physics-
A beam of light consisting of red, green and blue and is incident on a right angled prism. The refractive index of the material of the prism for the above red, green and blue wavelengths are 1.39, 1.44 and 1.47 respectively. The prism will :
A beam of light consisting of red, green and blue and is incident on a right angled prism. The refractive index of the material of the prism for the above red, green and blue wavelengths are 1.39, 1.44 and 1.47 respectively. The prism will :
physics-General
