Physics-

General

Easy

Question

# The effective focal length of the lens combination shown in figure is - 60 cm The radii of curvature of the curved surfaces of the plano-convex lenses are 12 cm each and refractive index of the material of the lens is 1.5 The refractive index of the liquid is

- 1.33
- 1.42
- 1.53
- 1.60

## The correct answer is: 1.53

### Related Questions to study

physics-

### A ray of ligth enters into a glass slab from air as shown .If refractive of glass slab is given by where A and B are constants and ‘t’ is the thickness of slab measured from the top surface Find the maximum depth travelled by ray in the slab Assume thickness of slab to be sufficiently large

### A ray of ligth enters into a glass slab from air as shown .If refractive of glass slab is given by where A and B are constants and ‘t’ is the thickness of slab measured from the top surface Find the maximum depth travelled by ray in the slab Assume thickness of slab to be sufficiently large

physics-General

physics-

### The refraction index of an anisotropic medium varies as A ray of light is incident at the origin just along y-axis (shown in figure) Find the equation of ray in the medium

### The refraction index of an anisotropic medium varies as A ray of light is incident at the origin just along y-axis (shown in figure) Find the equation of ray in the medium

physics-General

physics-

### Due to a vertical temperature gradient in the atmosphere, the index of refraction varies Suppose index of refraction varies as is the index of refraction at the surface and a A person of height h = 2.0 m stands on a level surface Beyond what distance will he not see the runway?

### Due to a vertical temperature gradient in the atmosphere, the index of refraction varies Suppose index of refraction varies as is the index of refraction at the surface and a A person of height h = 2.0 m stands on a level surface Beyond what distance will he not see the runway?

physics-General

physics-

### Find the variation of refractive index assuming it to be a function of y such that a ray entering origin at grazing incidence follows a parabolic path y = x^{2} as shown in fig

### Find the variation of refractive index assuming it to be a function of y such that a ray entering origin at grazing incidence follows a parabolic path y = x^{2} as shown in fig

physics-General

chemistry-

### Metal oxides which decomposes on heating is

### Metal oxides which decomposes on heating is

chemistry-General

chemistry-

### One mole of an organic compound *A* with the formula reacts completely with two moles of HI to form *X* and *Y*. When *Y* is boiled with aqueous alkali it forms *Z*. *Z* answers the iodoform test. The compound *A* is

### One mole of an organic compound *A* with the formula reacts completely with two moles of HI to form *X* and *Y*. When *Y* is boiled with aqueous alkali it forms *Z*. *Z* answers the iodoform test. The compound *A* is

chemistry-General

physics-

### A reflecting surface is represented by the equation A ray travelling in negative x-direction is directed towards positive y-direction after reflection from the surface at point P Then co-ordinates of point P are

### A reflecting surface is represented by the equation A ray travelling in negative x-direction is directed towards positive y-direction after reflection from the surface at point P Then co-ordinates of point P are

physics-General

physics-

### A bird in air is diving vertically over a tank with speed 5cm/s Base of the tank is silvered A fish in the tank is rising upward along the same line with speed 2cm/s Water level is falling at a rate of 2cm/s Speed of the image of bird relative to the fish looking upward in cm/s is

### A bird in air is diving vertically over a tank with speed 5cm/s Base of the tank is silvered A fish in the tank is rising upward along the same line with speed 2cm/s Water level is falling at a rate of 2cm/s Speed of the image of bird relative to the fish looking upward in cm/s is

physics-General

physics-

### A bird in air is diving vertically over a tank with speed 5cm/s Base of the tank is silvered A fish in the tank is rising upward along the same line with speed 2cm/s Water level is falling at a rate of 2cm/s Speed of the image of fish formed after reflection in the mirror as seen by the bird in cm/s

### A bird in air is diving vertically over a tank with speed 5cm/s Base of the tank is silvered A fish in the tank is rising upward along the same line with speed 2cm/s Water level is falling at a rate of 2cm/s Speed of the image of fish formed after reflection in the mirror as seen by the bird in cm/s

physics-General

maths-

### Consider the system of equations ax+by =0 , cx +dy=0 where a, b, c, d {0,1}

Statement ‐ I The probability that the system of equations has a unique solution is 3/8 Statement ‐ II The probability that the system has a solution is 1.

### Consider the system of equations ax+by =0 , cx +dy=0 where a, b, c, d {0,1}

Statement ‐ I The probability that the system of equations has a unique solution is 3/8 Statement ‐ II The probability that the system has a solution is 1.

maths-General

chemistry-

### Which alcohol cannot be oxidized by

### Which alcohol cannot be oxidized by

chemistry-General

physics-

### A bird in air is diving vertically over a tank with speed 5cm/s Base of the tank is silvered A fish in the tank is rising upward along the same line with speed 2cm/s Water level is falling at a rate of 2cm/s Speed of the image of fish as seen by the bird directly in cm/s is

### A bird in air is diving vertically over a tank with speed 5cm/s Base of the tank is silvered A fish in the tank is rising upward along the same line with speed 2cm/s Water level is falling at a rate of 2cm/s Speed of the image of fish as seen by the bird directly in cm/s is

physics-General

physics-

### A Ray of light goes from A in a medium where the speed of light is V_{1} to a point B in a medium where the speed of light is V_{2} as shown in figure The path of the rays as shown in figure Answer the following questions,based on the above paragraph The slope of curve is

### A Ray of light goes from A in a medium where the speed of light is V_{1} to a point B in a medium where the speed of light is V_{2} as shown in figure The path of the rays as shown in figure Answer the following questions,based on the above paragraph The slope of curve is

physics-General

physics-

### A Ray of light goes from A in a medium where the speed of light is V_{1} to a point B in a medium where the speed of light is V_{2} as shown in figure The path of the rays as shown in figure Answer the following questions,based on the above paragraph The time taken for the light to go from the point A to the point B in the figure

### A Ray of light goes from A in a medium where the speed of light is V_{1} to a point B in a medium where the speed of light is V_{2} as shown in figure The path of the rays as shown in figure Answer the following questions,based on the above paragraph The time taken for the light to go from the point A to the point B in the figure

physics-General

physics-

### Spherical aberration in spherical mirrors is a defect which is due to dependence of focal length ‘f’ on angle of incidence ‘ q ’ as shown in figure is given by where R is radius of curvature of mirror and q is the angle of incidence The rays which are closed to principal axis are called paraxial rays and the rays far away from principal axis are called marginal rays As a result of above dependence different rays are brought to focus at different points and the image of a point object is on a point Which of the following statements are correct regarding spherical aberration :

### Spherical aberration in spherical mirrors is a defect which is due to dependence of focal length ‘f’ on angle of incidence ‘ q ’ as shown in figure is given by where R is radius of curvature of mirror and q is the angle of incidence The rays which are closed to principal axis are called paraxial rays and the rays far away from principal axis are called marginal rays As a result of above dependence different rays are brought to focus at different points and the image of a point object is on a point Which of the following statements are correct regarding spherical aberration :

physics-General